# Mathematics Grade 11 P2 National Exemplar November 2014 Memo

> Grade 11 Mathematics Paper 2 memorandum from the National Exemplar November Exam 2014, 16 pages. Read online or download the free PDF.

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- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 11
- Document type: Memorandum
- Year: 2014
- Exam period: National Exemplar November Exam
- Paper: 2
- Curriculum: CAPS
- Pages: 16

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Mathematics · Grade 11 · National Exemplar November Exam · 2014. Memorandum, 16 pages. Read online or download the PDF.

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### Page 1

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                                         NATIONAL
                                    SENIOR CERTIFICATE

                                        GRADE/GRAAD 11

                             MATHEMATICS P2/WISKUNDE V2

                                        NOVEMBER 2014

                                        MEMORANDUM

MARKS/PUNTE: 150

                             This memorandum consists of 16 pages.
                            Hierdie memorandum bestaan uit 16 bladsye.

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Mathematics/P2/Wiskunde/V2                        2                                DBE/November 2014
                                        CAPS/KABV – Memorandum

NOTE:
• If a candidate answers a question TWICE, only mark the FIRST attempt.
• If a candidate has crossed out an attempt of a question and not redone the question, mark the
   crossed out version.
• Consistent accuracy applies in ALL aspects of the marking memorandum.
• Assuming answers/values in order to solve a problem is NOT acceptable.
LET WEL:
• Indien 'n kandidaat 'n vraag twee keer beantwoord, merk slegs die eerste poging.
• Indien 'n kandidaat 'n antwoord doodgetrek het, maar nie oorgedoen het nie, merk die
  doodgetrekte antwoord.
• Volgehoue akkuraatheid geld in ALLE aspekte van die memorandum.
• Aanname van antwoorde/waardes om 'n probleem op te los, is ONaanvaarbaar.

QUESTION/VRAAG 1

 1.1.1 IQR (A) = 30 – 20                                                      30 – 20
               = 10                                                           10
                                                                                                        (2)
 1.1.2 Data of Supermarket A is skewed to the left/Data van Supermark        
       A is skeef na links.                                                  comment/kommentaar
       OR
       Negatively skewed/negatief skeef                                                                 (1)
 1.1.3 Range/Omvang (B) = 35 – 6                                              35 – 6
                            = 29                                              29
                                                                                            (2)
 1.1.4 Supermarket A                                                       correct choice/
       • Supermarket A received 25 or more deliveries on more than 7        regte keuse
            days whilst Supermarket B received 25 or more deliveries on    reason/rede
            less than 7 days/ Supermark A het op meer as 7 dae 25 of meer                   (2)
            aflewerings ontvang terwyl Supermark B op minder as 7 dae
            soveel aflewerings ontvang het.
  1.2            x = 24,5
        2 x + 293                                                           2 x + 293
                   = 24,5                                                 
            14                                                                  14
        2 x + 293 = 343                                                    2x + 293 = 343
                2 x = 50
                  x = 25                                                      25
                                                                                                    (3)
                                                                                                   [10]

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Mathematics/P2/Wiskunde/V2                               3                                    DBE/November 2014
                                               CAPS/KABV – Memorandum

QUESTION/VRAAG 2

 2.1 28 days/dae                                                                                answ/antw
                                                                                                            (1)
 2.2 12 days                                                                                    No. of days/
        12                                                                                       getal dae
     ∴     × 100
        28
      = 42,86%                                                                                  percentage/
                                                                                                 persentasie
       Accept/Aanvaar 12,5 days which is/dae, wat gelyk is aan 44,64%
       OR
       Accept/Aanvaar 13 days which is/dae, wat gelyk is aan 46,43%

                                                                                                                   (2)
 2.3
                             Temperature, T, in
                                                              Frequency
                              degrees Celsius
                                19 ≤ T < 21                       2                             2 and/en 6
                                21 ≤ T < 23                       6
                                                                                                9 and/en 5
                                23 ≤ T < 25                       9
                                25 ≤ T < 27                       5
                                27 ≤ T < 29                       4                             4 and/en 2
                                29 ≤ T < 31                       2

                                                                                                                   (3)
 2.4
                               FREQUENCY POLYGON
                   10
                                                                                                anchored at /
                    9                                                                             geanker by
                                                                                                  (18 ; 0)
                    8
                                                                                                  and/en
                    7                                                                             (32 ; 0)
                                                                                                points at
                    6

       Frequency
                                                                                                  midpoints/
                    5                                                                             punte by
                                                                                                  middelpunte
                    4
                                                                                                straight lines
                    3                                                                             joining pts/
                                                                                                  reguitlyne
                    2                                                                             verbind punte
                    1                                                                           all points
                                                                                                  plotted/
                    0                                                                             alle punte
                        17    19    21    23       25    27     29      31     33      35         geplot
                              Average daily temperature (in degrees Celsius)                                  (4)
                                                                                                             [10]

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Mathematics/P2/Wiskunde/V2                                4                                   DBE/November 2014
                                                CAPS/KABV – Memorandum

QUESTION/VRAAG 3

  3.1              12 + 9                                                                 substitution into
         mAC =                                                                             gradient formula/
                   −9+3
                   21
                                                                                           subst in gradiënt-
                 =                                                                          formule
                   −6
                                                                                                 7
                    7                                                                     −
                 =−                                                                              2
                    2
                                                                                                                   (2)
  3.2                             7
         m         =m        =−           (parallel lines/parallelle lyne)                gradients equal/
             RNS        AC        2
            7                                                                               gradiënte gelyk
         y=− x                                                                            equation/vgl
            2
                                                                                                           (2)
  3.3                                 2
                                 NB = (5 5 )
                                                   2

                        2             2
                ( a − 9) + (7 − 9) = 125                                                  subst into distance
           2                                                                               formula/subst in
         a − 18a + 81 + 4 − 125 = 0                                                        afstandformule
                      2                                                                   st form/st vorm
                    a − 18a − 40 = 0
                                                                                          factors/faktore
                   (a − 20)(a + 2) = 0                                                    answ/antw
                    a ≠ 20 ∴ a = −2                                                                         (4)
  3.4                       7                                                                         7
         tan α = mAC = −                                                                  tan α = −
                            2                                                                         2
               α = 180° − 74,05°
                 = 105,95°                                                                α = 105,95°

                             3
         tan β = mBC =                                                                            3
                             2                                                            tan β =
               β = 56,31°                                                                         2
                                                                                          β = 56,31°
         ∴θ = 105,95° − 56,31°
            = 49,64°                                                                      θ = 49,64°
                                                                                                               (5)
                                                                                                              [13]

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Mathematics/P2/Wiskunde/V2                        5                                   DBE/November 2014
                                        CAPS/KABV – Memorandum

QUESTION/VRAAG 4
 4.1 Perimeter/Omtrek ABCD = 4 × AD (sides of rhombus all                         subst into distance
     equal/sye van ruit almal gelyk)                                               form/ subst in
         AD = (3 + 8) 2 + (9 − 6) 2                                                afstandformule
                                                                                  130 OR/OF
              = 130 OR/OF 11,40                                                     11,40
         Perimeter/Omtrek = 4 130 OR/OF 45,61                                     4 130 OR/OF
                                                                                   45,61
                                                                                                    (3)
  4.2    m BD = 3                                                                 m BD = 3
         mAC × mBD = −1         (diagonals of a rhombus/hoeklyne van ruit)
                    1                                                                           1
         ∴ mAC = −                                                                mAC = −
                    3                                                                           3
         y − y1 = m( x − x1 )                 y = mx + c
                  1                                 1
         y − 6 = − ( x + 8)                   6 = − (− 8) + c                     subst into correct
                  3                                 3                              form/subt in
               1     8 18                     10                                   korrekte formule
         y =− x− +                OR/OF           =c
               3     3 3                       3
               1     10                               1   10
         y =− x+                                y =− x+                           answer/antw
                3     3                               3    3
                                                                                                           (4)
  4.3    At/By K:
                  1     10
          3x = − x +                                                              equate equations/
                  3      3                                                         stel vgls gelyk
          9 x = − x + 10
         10 x = 10
            x =1                                                                  x=1
           y = 3(1) = 3                                                           y=3
           K(1 ; 3)                                                                                        (3)
         OR/OF
                  y = 3x
         x + 3(3 x) = 10                                                          subst of/subst van
                                                                                   y = 3 x into
              10 x = 10
                                                                                   x + 3 y = 10
                  x =1
                                                                                  x=1
            y = 3(1) = 3
                                                                                  y=3
           K(1 ; 3)
                                                                                                    (3)
         OR/OF
         x = −3 y + 10
         3(−3 y + 10) − y = 0                                                     subst of/subst van
         − 9 y + 30 − y = 0                                                        x = −3 y + 10 into
         − 10 y = −30                                                              3x − y = 0
              y=3                                                                 y=3
            x = –3(3) + 10
            x =1                                                                  x=1
           K(1 ; 3)                                                                                        (3)
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Mathematics/P2/Wiskunde/V2                        6                                   DBE/November 2014
                                        CAPS/KABV – Memorandum

  4.4    xB + 3                yB + 9
                =1                    =3
           2                     2
         xB + 3 = 2            yB + 9 = 6
             x B = −1               y B = −3                                      x value/waarde
         B(–1 ; –3)                                                               y value/waarde
                                                                                                           (2)
         OR/OF

         xB = −1                 yB = −3 (by translation/deur translasie)         x value/waarde
         B(–1 ; –3)                                                               y value/waarde
                                                                                                           (2)
  4.5           6+3      9
         m AB =       =−                                                          subst into gradient
               − 8 +1    7                                                         formula/subst in
               9−6 3                                                               gradiëntformule
         mAD =      =
               3 + 8 11                                                           gradient AB
         mAB × mAD ≠ −1                                                           gradient AD
         ABCD is not a square/ is nie 'n vierkant   ( BÂD ≠ 90° )                ≠ –1
                                                                                  S/R
         OR/OF                                                                                      (5)

         C(10 ; 0)                                                                C(10 ; 0)
         BD 2 = (3 − (−1)) 2 + (9 − (−3)) 2                                       subst into distance
                                                                                   formula/subst in
              = 160                                                                afstandformule
         BD = 4 10 OR/OF 12,65
                                                                                  4 10 OR 12,65
         AC 2 = (−8 − 10) 2 + (6 − 0) 2
             = 360
         AC = 6 10 OR/OF 18,97                                                    6 10 OR 18,97
                                                                                  S/R
         ABCD is not a square/is nie 'n vierkant (BD ≠ AC)
                                                                                               (5)
                                                                                              [17]

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Mathematics/P2/Wiskunde/V2                            7                               DBE/November 2014
                                            CAPS/KABV – Memorandum

QUESTION/VRAAG 5

 5.1.1   cos 203° = − cos 23°                                                     reduction/herlei
                   = −p                                                           answer/antw
                                                                                                   (2)
 5.1.2   sin 293° = − sin 67°                                                     reduction/herlei
                   = − cos 23°                                                    co-ratio/ko-verh
                   = −p
                                                                                  answ/antw ito/v p
                                                                                                   (3)
  5.2         sin(360° − x). tan(− x)
         cos(180° + x).(sin 2 A + cos 2 A)
           (− sin x)(− tan x)                                                     − sin x
         =
              (− cos x)(1)                                                        − tan x
                      sin x                                                     − cos x
           (− sin x) −                                                          1
                       cos x 
         =                                                                          sin x 
                  − cos x                                                         −      
                 2                                                                  cos x 
             sin x
         =−
             cos 2 x
         = − tan 2 x                                                              − tan 2 x
                                                                                                           (6)
 5.3.1               2
                 cos x + (1 + sin x)    2
         LHS =                                                                    numerator/teller
                   (1 + sin x). cos x                                             denominator/
                                                                                    noemer
          cos 2 x + 1 + 2 sin x + sin 2 x                                         multiplication/
       =
                 (1 + sin x). cos x                                                vermenigvuldiging
           1 + 1 + 2 sin x                                                        identity/identiteit
       =
          (1 + sin x). cos x
                                                                                  fact/faktor
             2(1 + sin x)                                                          numerator/teller
       =
          (1 + sin x). cos x
            2
       =
          cos x
                                                                                                           (5)
       = RHS
 5.3.2 Undefined if/ongedefinieerd as:
       sin x = –1 or cos x = 0                                                    90°
       ∴ x = 90° ; 270°                                                           270°
                                                                                                           (2)
  5.4    sin 2 x = 4 cos 2 x
         tan 2 x = 4                                                              tan 2 x = 4
         2 x = 75,96° + k .180°                                                   75,96°
         x = 37,98° + k .90° ; k ∈ Z                                              37,98°
                                                                                  k .90°
                                                                                  k ∈Z
                                                                                                           (5)

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Mathematics/P2/Wiskunde/V2                        8                                    DBE/November 2014
                                        CAPS/KABV – Memorandum

 5.5.1       x2 + y2 = r 2
         x 2 + ( 3) 2 = 2 2                                                        subst
                  x2 = 1
                   x = ±1
                   x =1       (since P lies in the 1st quadrant/aangesien P in     x=1
                               die 1ste kwadrant lê)                                                        (2)
 5.5.2               3
         sin PÔT =                                                                correct ratio/
                    2
                                                                                    korrekte verh
            PÔT = 60°                                                             60°
         PÔT + α = 90°
                 α = 90° − 60°
                    = 30°                                                          answer/antw
                                                                                                            (3)
 5.5.3                b
         sin( −30°) =                                                              correct ratio/
                     20                                                             korrekte verh
         b = 20 sin(−30°)                                                          b = 20 sin(−30°)
         b = −10                                                                   b = –10
                      a
         cos(−30°) =
                      20                                                           correct ratio/
         a = 20 cos(−30°)                                                            korrekte verh
         a = 10 3 OR/OF 17,32                                                      a = 10 3 OR17,32
         Q(10 3 ; − 10) OR/OF Q(17,32 ; –10)
                                                                                                            (5)
         OR/OF

         OQ2 = 400
                                                                                   subst into distance
         a² + b² = 400
                                                                                    formula/subst in
         PQ² = 2² + 20²
                                                                                    afstandformule
         PQ² = 404
         (a − 1) 2 + (b − 3 ) 2 = 404                                              subst into distance
                                                                                    formula/subst in
         a 2 − 2a + 1 + b 2 − 2 3b + 3 = 404                                        afstandformule
         400 − 2a + 4 − 2 3b = 404
         2a = −2 3b
         a = − 3b                                                                  a = − 3b

         (− 3b) 2 + b 2 = 400
         4b 2 = 400
         b 2 = 100                                                                 b = −10
         b = −10        (b < 0)
         a = − 3 (−10)
         a = 10 3                                                                  a = 10 3 OR17,32
         ∴ Q(10 3 ; − 10)                                                                         (5)
                                                                                                [33]
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Mathematics/P2/Wiskunde/V2                          9                               DBE/November 2014
                                          CAPS/KABV – Memorandum

QUESTION/VRAAG 6

  6.1    a=1                                                                    a=1
         b=2                                                                    b=2
         p = 45°                                                                p = 45°
                                                                                                         (3)
  6.2     x ∈ (−90° ; 0°)                                                       extreme values/
                                                                                 uiterste waardes
                                                                                correct notation/
                                                                                 korrekte notasie
         OR/OF                                                                                    (2)
                                                                                extreme values/
         − 90° < x < 0°                                                          uiterste waardes
                                                                                correct notation/
                                                                                 korrekte notasie
         OR/OF                                                                                    (2)
                                                                                extreme values/
         between − 90° and 0° /tussen –90° en 0°                                 uiterste waardes
                                                                                correct notation/
                                                                                 korrekte notasie
                                                                                                  (2)
  6.3    f (2 x) = cos 2(2 x) = cos 4 x                                         cos 4x
         ∴ period/periode = 90°                                                 90°
                                                                                                  (2)
  6.4    h( x) = 3 cos 2 x − 1
         Minimum value/waarde = –4                                               –4
                                                                                                         (2)
  6.5    move 45° to the left and then reflect about the x-axis/                45° left/links
         skuif 45° na links en reflekteer dan om die x-as                       reflection x-axis/
                                                                                 refleksie om x-as
         OR/OF

         The graph of g must be moved 135° to the right/                        135° right/regs
         Die grafiek van g moet 135° na regs beweeg.                                             (2)
                                                                                                [11]

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Mathematics/P2/Wiskunde/V2                        10                              DBE/November 2014
                                        CAPS/KABV – Memorandum

QUESTION/VRAAG 7

 7.1.1   AĈB = 180° − 150° = 30°                                            30°
           AB         6                                                      subst into sine rule/
                =                                                             subst in sin-reël
         sin 30° sin 110°
                                                                             AB = 3,19
             AB = 3,19m                                                                         (3)
 7.1.2 Area ∆ABC:
         1
       = .AB.BC. sin B
         2
         1                                                                   subst into correct
       = × 3,19 × 6 × sin 40°                                                 form/subst in
         2                                                                    korrekte formule
                   2
         = 6,15m                                                             6,15
                                                                                               (2)
 7.1.3                            1
         Volume of pyramid =        area of base × ⊥ height                  correct formula/
                                  3                                           korrekte formule
           1                                                                 subst
         =   × 6,15 × 8
           3
         = 16,4m 3                                                           answer/antw
                                                                                                       (3)
  7.2    radius of base/radius van basis:
          r                                                                   r
            = tan 36°                                                          = tan 36°
          h                                                                   h
         r = 2 tan 36° = 1,45m                                               r = 2 tan 36° = 1,45

         slant height/skuinshoogte:                                              l    1
                                                                                  =
          S       1                                                              h cos 36°
            =
          h cos 36°
                 2                                                          
         S=           = 2,47 m                                                       2
              cos 36°                                                        S=           = 2,47
                                                                                  cos 36°
                                          2                                subst into correct
         SA = π(2tan 36°)2 + π(2tan 36°)                                    form/subst in
                                          cos 36° 
                                                                              korrekte formule
            = 17,92 m2
                                                                             answer/antw
         OR/OF

         Surface area of cone = area of base + area of curved surface
         buite-opp van keël = opp van basis + opp van geboë opp
                              = πr 2 + πrS
                                = π (1,45) 2 + π (1,45)(2,47)                subst into correct
                                                                              form/subst in
                                = 17,86m 2
                                                                              korrekte formule
                                                                             answer/antw

                                                                                                   (6)
                                                                                                  [14]

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Mathematics/P2/Wiskunde/V2                        11                                    DBE/November 2014
                                        CAPS/KABV – Memorandum

QUESTION/VRAAG 8

8.1                                     M
                                                2              T
                                            1       37°

                                                    O 2
                                                      1

                                                                   S

                                   P

 8.1.1   M̂ + M̂ = 90° (∠ in semi circle/∠ in halfsirkel or/of diameter            S/R
            1     2
                             subtends right∠/midlyn onderspan regte∠ /
                                      1
                             or/of ∠ )
                                      2
                                                                                   S
         M̂ = 53°                                                                                            (2)
            1

         OR/OF

         Ô 2 = 74°       (∠ at centre/midpt = 2 ×∠ at circum/by omtrek)           S/R
         Ô1 = 106°       (∠s on a str line/∠e op reguitlyn)
                                                                                   S
         M̂ = 53°         (∠ at centre/midpt = 2 ×∠ at circum/by omtrek)
            1                                                                                                (2)
 8.1.2   Ô = 2 × M̂      (∠ at centre/midpt = 2 ×∠ at circum/by omtrek)           S/R
           1          1                                                            S
         Ô1 = 106°                                                                                          (2)

         OR/OF

         Ô 2 = 74°       (∠ at centre/midpt = 2 ×∠ at circum/by omtrek)           S/R
         Ô1 = 106°       (∠s on a str line/∠e op reguitlyn)                       S
                                                                                                             (2)

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Mathematics/P2/Wiskunde/V2                          12                                  DBE/November 2014
                                          CAPS/KABV – Memorandum

8.2

                                         K

                               O 106°           1    T
                              2    1                                                          M

                                         L

 8.2.1   Ô = 360° − 106° = 254° (∠s round a pt or ∠s in a rev)                    S
           2
                                        (∠e om 'n pt of ∠e omw)
              1
         T̂ = × Ô           (∠ at centre/midpt = 2 ×∠ at circum/by omtrek)
           1 2     2                                                               S
            = 127°                                                                 R
                                                                                                             (3)
 8.2.2 KO = OL         (radii equal/radiusse gelyk)                                S
       KM = ML         (Tans from common/same pt/rklyne van dies pt)               S/R
       ∴ KOLM is a kite (adj sides of quad are =/aangr sye v vh =)                 S/R
                                                                                                             (3)
 8.2.3   OK̂M = 90°       (tan/rkl ⊥ radius or/of tan/rkl ⊥ diam/midlyn)           S/R
         OL̂M = 90°       (tan/rkl ⊥ radius or/of tan/rkl ⊥ diam/midlyn)
         OK̂M + OL̂M = 180°
         OKML = cyc quad/kdvh
                                                                                   S
         (opp ∠s quad supp or converse opp ∠s of cyclic quad)/                     R
         (tos ∠e vierh supp of omgek tos ∠e van kdvh)                                                        (3)
 8.2.4   M̂ + Ô1 = 180°     (opp ∠s of cyclic quad/tos ∠e van kdvh)               R
                                                                                   S
         M̂ = 74°
                                                                                                         (2)
                                                                                                        [15]

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### Page 13

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Mathematics/P2/Wiskunde/V2                        13                                         DBE/November 2014
                                        CAPS/KABV – Memorandum

QUESTION/VRAAG 9
                                            K

                                                12

                                                                   L
                                                               2
                                                                   1

                                                               20°
                                                                    1 M
                                                                   2 4
                                                                     3

                                                                               1
                                                     1
                                                         2
                                                                              2
                                                     N                             P

  9.1    NK̂M = K̂ 1 = 20°               (equal chords; equal ∠s)                      S
                                         (gelyke koorde; gelyke ∠e)                    R
                                                                                                                (2)
  9.2    Alternate ∠s are equal/verwiss ∠e gelyk                                        R
                                                                                                                (1)
  9.3  NM = LM                             (radii)                                      S
       NM = KL                             (given/gegee)                                S
       ∴ KL = LM                                                                                                (2)
 9.4.1 MK̂L = K̂ = 20°            (∠s/e opp equal sides/to gelyke sye)                    S/R
                2
                                                                                          S
         KL̂M = L̂ 2 = 140°       (∠s sum in ∆ /∠e som in ∆)                              S
         KN̂M = N̂ 1 = 180° − 140° = 40° (opp ∠s of cyclic quad/                          R
                                           tos ∠e van kdvh)                                                     (4)
 9.4.2   KM̂N = M̂ 2 = 180° − (20° + 40°) = 120° (∠s sum in ∆ /                         S
                                                   ∠e som in ∆)
         LM̂N = M̂ 1 + M̂ 2 = 20° + 120° = 140°
         LP̂N = P̂1 + P̂2 = 70°         (∠ at centre = 2 ×∠ at circumference)           S R
                                        (∠ by midpt = 2 ×∠ by omtrek)                                       (3)
                                                                                                           [12]

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### Page 14

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Mathematics/P2/Wiskunde/V2                        14                              DBE/November 2014
                                        CAPS/KABV – Memorandum
QUESTION/VRAAG 10

 10.1         Construction: Draw diameter AD and join DB.                    construction/
              Konstruksie: Trek middellyn AD en verbind DB                    konstruksie
                                            D

                              C                         B

                                              O

                              P          A                   T
              Proof/Bewys:
              BÂT + DÂB = 90°     (tangent/rklyn ⊥ radius)                 S R
              DB̂C + CB̂A = 90°      (∠ in semi circle/halfsirkel)           S R
              DÂB + AD̂B = 90°      (∠s/e of/van ∆)
              BÂT = AD̂B
              BĈA = AD̂B      (∠s in same segment/∠e in dies segment)       S/R
              BÂT = BĈA                                                                              (6)

              OR/OF

              Construct diameter AD and join DC.                             construction/
              Konstrueer middellyn AD en verbind DC.                          konstruksie
                                            D

                              C                         B

                                              O

                              P             A                T
              Proof/Bewys:
              BÂT + DÂB = 90°     (tangent/rklyn ⊥ radius)                 S R
              DĈB + BĈA = 90°     (∠ in semi circle/halfsirkel)            S R
              BĈA = 90° − DĈB
              DÂB = 90° − BÂT
              DĈB = DÂB       (∠s in same segment/∠e in dies segment)      S/R
              BÂT = BĈA
                                                                                                       (6)
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Mathematics/P2/Wiskunde/V2                        15                                              DBE/November 2014
                                        CAPS/KABV – Memorandum

              OR/OF

              Construction: Draw radii OA and OB.                                           construction/
              Konstruksie: Trek radiusses OA en OB.                                          konstruksie

                             C                                B

                                            O

                             P              A                         T

              Proof/Bewys:
              OÂB + BÂT = 90°                     (tangent/rklyn ⊥ radius)                S R
              OÂB = 90° − BÂT
              OB̂A = 90° − BÂT                     (∠s opp = sides/∠e to = sye)
                                                                                            S
              AÔB = 180° − 2(90° − BÂT)           (∠s/e of/van ∆)
               AÔB = 2BÂT                                                    S
               AÔB = 2Ĉ               (∠ at centre = 2 ×∠ at circumference/  S/R
               BÂT = BĈA               ∠ by midpt = 2 ×∠ by omtrek)
                                                                              (6)

10.2                                                    P

                                                        1 2

                                                                          1     S
                                                                              2 3

                                                1                     2
                                        Q           2             1       3
                                                                      R                       T

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Mathematics/P2/Wiskunde/V2                           16                               DBE/November 2014
                                           CAPS/KABV – Memorandum

 10.2.1(a)    Tan chord theorem/rklyn-koordstelling                              R
                                                                                                   (1)
 10.2.1(b)    ∠s in same segment/ ∠e in dieselfde segment                        R
                                                                                                   (1)
 10.2.2        R̂ = P̂ + T̂           (ext ∠ of ∆/ buite∠ v ∆)                   S
                 1     2
               P̂2 = Q̂ 2             (from/vanaf 10.2.1(b))
               Q̂1 = T̂               (from/vanaf 10.2.1(a))
              ∴ Q̂ + Q̂ = P̂ + T̂                                                S
                  1    2     2
              ∴ Q̂ + Q̂ = R̂                                                     S
                  1    2     1
              ∴PQ = PR        (sides opp =∠s/sye to =∠e)                         S/R
              ∴∆PQR = isosceles triangle/gelykbenige driehoek                                      (4)
 10.2.3        R̂ 2 = Q̂1             (∠s in same segment/∠e in dies segment)    S/R
               T̂ = Q̂1               (from/vanaf 10.2.1(a))
               R̂ 2 = T̂                                                         S
              PR is a tangent to circle RST at R (converse tan chord th)
              PR is 'n rklyn aan sirkel RST by R (omgekeerde rkl-kdst)           R
                                                                                                   (3)
              OR/OF

               P̂1 = 180° − (Q̂1 + Q̂ 2 + R̂ 1 )   (∠s/e of/van ∆)               S
               R̂ 2 = Q̂1             (∠s in same segment/∠e in dies segment)  S/R
               Q̂1 = T̂                (from/vanaf 10.2.1(a))
                                                                               R
              ∴ R̂ 2 = T̂                                                                          (3)
                                                                      TOTAL/TOTAAL:              150

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