# Mathematics Grade 12 Paper 2 Western Cape Mock 2018 Memo

> Grade 12 Mathematics Paper 2 memorandum from the Western Cape Mock Exam 2018, 15 pages. Read online or download the free PDF.

- Page: https://www.hlayiso.com/library/2018-grade-12-math-trial-exam-paper-2-wc-memo-overberg/0b4033e8-e660-4f81-81e6-50ca033db60e
- Updated: 2026-09-27
- Subject: Mathematics
- Grade: Grade 12
- Document type: Memorandum
- Year: 2018
- Exam period: Western Cape Mock Exam
- Paper: 2
- Curriculum: CAPS
- Pages: 15

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## About this document

Mathematics · Grade 12 · Western Cape Mock Exam · 2018. Memorandum, 15 pages. Read online or download the PDF.

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### Page 1

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                OVERBERG
            EDUCATION DISTRICT/
             ONDERWYSDISTRIK

                   GEMEENSKAPLIKE VRAESTEL/

                         COMMON PAPER

                     GRAAD/GRADE 12

                   WISKUNDE V2 / MATHEMATICS P2
                          MEMORANDUM

                         SEPTEMBER 2018

PUNTE/MARKS: 150

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NOTE:
 If a candidate answers a question TWICE, mark only the first one.
 Consistent accuracy applies in ALL aspects of the marking memorandum.
LET WEL:
 Indien ŉ kandidaat ŉ vraag TWEE keer beantwoord, merk slegs die eerste poging.
 Volgehoue akkuraatheid is deurgaans op ALLE aspekte van die memorandum van toepassing.

 QUESTION/ VRAAG 1
        SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                                       DESCRIPTORS/                 Marks
                                                                                      BESKRYWERS
 1.1              Punte / Marks               Frekwensie     Kumulatiewe
                                              / Frequency    Frekwensie/
                                                             Cumulative
                                                              Frequency
              0 < 𝑥 ≤ 10                      2              2                         first 3 values / eerste
              10 < 𝑥 ≤ 20                     9              11                        3 waardes
              20 < 𝑥 ≤ 30                     21             32
              30 < 𝑥 ≤ 40                     32             64                        second 3 values / tweede
              40 < 𝑥 ≤ 50                     19             83                         3 waardes
              50 < 𝑥 ≤ 60                     7              90                                                      (2)
 1.2                                100
                                     90                                                upper boundaries /

            Cumulative frequency/
                                     80                                                 boonste grense
                                     70
                                     60
                                     50                                                cumulative frequency /

           Kumulatiewe frekwensie
                                     40
                                                                                        kumulaiewe frekwensie
                                     30
                                     20
                                     10
                                      0                                                anchor / anker
                                          0   10    20       30        40   50   60
                                                         Punte/Marks
                                                                                                                     (3)
 1.3    90 – 74 = 16                                                                   90 – 74
                                                                                       16
                                                                                      Answer only: full marks
                                                                                      Accept from 14 to 18
                                                                                      / Aanvaar: vanaf 14 tot 18     (2)
                                                                                                                     [7]

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QUESTION/VRAAG 2
        SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD         DESCRIPTORS/          Marks
                                                        BESKRYWERS
2.1.1   𝑎 = 122,67                                       𝑎 = 122,67
        𝑏 = −10,74                                       𝑏 = −10,74
        𝑦 = 122,67 − 10,74𝑥
                                                        𝑦 = 122,67 − 0,74𝑥     (3)
2.1.2   𝑦 = 122,67 − 10,74(2,5)                          substitution /
                                                          substitusie
           = 95,82
                                                         answer /
          = 96                                            antwoord
                                                                                (2)
2.1.3   Dalvon. The gradient is steeper.                 Dalvon
        Dalvon. Die gradient is steiler.                 reason / rede         (2)
2.2.1   1,50 kg since the standard deviation is 0        1,50 kg
                                                         reason / rede         (2)
2.2.2   Andrew: 1,06 × 11 = 11,66 kg                     11,66 kg
        Bongi: 0,77 × 16 = 12,32 kg                      12,32 kg
        ∴ Bongi won the award                            Bongi                 (3)
                                                                                [12]

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QUESTION/ VRAAG 3
        SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD    DESCRIPTORS/                   Marks
                                                   BESKRYWERS
3.1.1 K(−1+5 ; −3−5)                                substitution / substitusie
          2      2
                                                    answer / antwoord             (2)
      ∴ K (2; −4)
3.1.2 −1+𝑝 = 1 and          −3+𝑞                       −1+𝑝
                                   =3                        =1
        2                    2                           2
                                                       −3+𝑞
                                                             =3
        ∴𝑝=3           and 𝑞 = 9                        2

                                                                                   (2)
3.1.3          9+5
        𝑚AB =        = −7
               3−5
        tan𝛼 = −7                                   tan𝛽 = −7
        ∴ 𝛼 = 98,13°                                𝛽 = 98,13°
                                                   CA 3.1.2                        (2)
3.1.4

                                   𝛽

                −3+5
        𝑚BC = −1−5                                 substitution / substitusie
                −1
             = 3

                 1                                             1
        tan𝛽 = −                                   tan𝛽 = − 3
                 3
        ∴ 𝛽 = 180° − 18,43°
            = 161,57°                              𝛽 = 161,57°

           ̂ C = 63,44°
        ∴ AB                                         ̂ C = 63,44°
                                                   AB
                                                   CA 3.1.3                        (4)

                                        4

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       SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                  DESCRIPTORS/BESKRYWERS         Marks

3.1.5 KL = √(1 − 2)2 + (3 + 4)2                                  correct substitution /
                                                                  korrekte substitusie
       KL= √50 or 5√2                                            𝑎𝑛𝑠𝑤𝑒𝑟
                                                                  CA 3.1.1                      (2)
3.1.6 AB = 2√50 or 10√2                                          AB = 2√50 or 10√2
      midpoint theorem / middelpuntstelling                      midpoint theorem /
                                                                  Middelpuntstelling
                                                                  CA 3.1.5                      (2)
3.2             1                                                 1
      Area =        × 5 × h = 10                                 2 × 5 × h = 10
                2
                        ∴ℎ=4                                    ℎ=4
                       ∴ 𝑦P = - 4                                𝑦𝑃 = - 4
                                                                 PA = PB; equating distance
      √(𝑥 − 5)2 + (𝑦 − 0)2 = √(𝑥 − 7)2 + (𝑦 − 6)2               formules/ gelyk stel van
      𝑥 2 − 10𝑥 + 25 + 𝑦 2 = 𝑥 2 − 14𝑥 + 49 + 𝑦 2 − 12 𝑦 + 36   afstand formules
               4𝑥 + 12𝑦 = 60                                     expansion / uitbreiding
                𝑥 + 3𝑦    = 15
                                                                 simplify / vereenvoudig
                𝑥 + 3(−4) = 15
                        𝑥 = 27                                   𝑥 = 27
                        P(27; −4)
                                                                                               (7)
                                                                                               [21]

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QUESTION /VRAAG 4
        SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                          DESCRIPTORS/                       Marks
                                                                         BESKRYWERS
4.1.1       C(0; −4)
              −4−0                                                                  −4−0
        𝑚AC = 0+2 = −2                                                    𝑚AC = 0+2 = −2

                              1
        𝑚AC × 𝑚BC = −2 × 2 =  1                                          𝑚AC × 𝑚BC =  1
        ∴ 𝐵𝐶 ⊥ 𝐴𝐶
                                                                                                             (2)
4.1.2 AB is a diameter /            (converse of angle in semi-circle)    AB is a diameter /
      AB is ‘n middellyn           (omgekeerde van hoek in halfsirkel)     AB is ‘n middellyn

            1
        0= 𝑥−4
            2
        𝑥=8
        𝐵(8; 0)                                                          𝑥=8

        ∴ center of circle (3; 0) ; 𝑟 = 5
        ∴ (𝑥 − 3)2 + 𝑦 2 = 25                                             (𝑥 − 3)2 + 𝑦 2
                                                                          25                                (4)
4.1.3             0+4 4                                                   𝑚radius =
                                                                                        4
        𝑚radius =        =                                                              3
                  3−0 3
                        3                                                                   3
        ∴ 𝑚𝑡angent = −                                                   𝑚tangent = − 4
                        4
                                   3
        Equation of tangent: 𝑦 = − 4 𝑥 − 4
                                                                                   3
                                                                          𝑦 = −4𝑥 − 4
                                                                                                            (3)
4.2     𝑥 2 + 8𝑥 + (4)2 + 𝑦 2 + 10y +(5)2 = −𝑘 + (4)2 +(5)2               completing square /
        ∴ (𝑥 + 4)2 + (𝑦 + 5)2 = −𝑘 + 41                                    vierkantsvoltooiing
                      −𝑘 + 41 = 49                                        equation ito k / vergelyking
                                                                            i.t.v k
                             𝑘 = −8
                                                                          −𝑘 + 41 = 49
                                                                          𝑘 = −8
                                                                                                            (5)
4.3.1
                                                                          circle / sirkel
                                                                          intersecting all 4 quadrants /
                                                                           sny al 4 kwadrante
                                  . Q (-1;2)

                                                                                                            (2)
4.3.2 (𝑥 + 1)2 + (𝑦 − 2)2 = 9                                             (𝑥 + 1)2 + (𝑦 − 2)2
                                                                         9                                 (2)
                                                                                                            [18]

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QUESTION /VRAAG 5
        SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                             DESCRIPTORS/                    Marks
                                                                            BESKRYWERS
5.1.1       sin(900 − 𝜃)                                                       length of OP = √41
            = cos 𝜃                                                             𝑐𝑜𝑠 𝜃
               5
            = 41                                                            
                                                                                 5
             √
                                                                                √41                          (3)
5.1.2                               4
             In ∆OPR ; tan 𝜃 = 5                  OR
                                                                        5
                                      5           tan(180° − 𝜃) =
             In ∆OQT ; tan 𝜃 = 𝑎                                        𝑎
                                                          5
                                                  −tan𝜃 =
             4   5                                        𝑎
        ∴      =                                      4 5                                   4   5
             5   𝑎                                  − =                        equate 5 = 𝑎
                                                      5 𝑎
              4𝑎 = 25                              ∴ 4𝑎 = −25
                       25      1                        25          1
             𝑎 = −        = −6                    𝑎=−        = −6              answer / antwoord
                        4      4                        4           4                                        (2)
5.2.1            cos( 𝜃−180°). cos (90°+𝜃)
                       2 tan (180− 𝜃)
                                                                               − cos 𝜃
                      −cos 𝜃.−sin 𝜃
                  =                                                             −sin 𝜃
                        −2 tan 𝜃

                      sin 𝜃 cos 𝜃                                               −2 tan 𝜃
                 =
                       −2 𝑡an 𝜃

                     sin 𝜃 cos 𝜃          cos 𝜃
                 =                  ×                                                𝑠𝑖𝑛𝜃           cos 𝜃
                         −2               sin 𝜃                                 × 𝑐𝑜𝑠𝜃 𝒐𝒓 ÷ sin 𝜃
                       cos2 𝜃
                 =                                                              answer / antwoord
                        −2
                                                                                                             (5)
5.2.2   tan𝜃 = 0 or / of tan𝜃 undefined                                      𝜃 = 0°

        ∴ 𝜃 = 0° or / of 𝜃 = 180° or / of 𝜃 = 90°                            𝜃 = 180°

                                                                             𝜃 = 90°
                                                                                                             (3)

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        SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                                DESCRIPTORS/              Marks
                                                                               BESKRYWERS
5.3            sin2𝜃
        LHS = sin𝜃                                                                  2cos 𝜃 sin𝜃
                                                                 OR
          2sin𝜃. cos𝜃                                                                2cos 𝜃
        =                                             4cos2 𝜃−[(2cos²𝜃−1)+1]
             sin𝜃                          RHS =
                                                                     𝑐𝑜𝑠𝜃

        = 2cos𝜃                              4cos2 𝜃 − 2cos2 𝜃 + 1 − 1
                                           =
                           cos2𝜃+1                     cos𝜃
        RHS = 4cos 𝜃 −
                               𝑐𝑜𝑠𝜃
                                               4cos2 𝜃 − 2cos²𝜃
                           2               =                                         2cos2 𝜃 − 1
                    2cos 𝜃 − 1 + 1                        cos𝜃
        = 4 cos 𝜃 −
                         cos𝜃                                                        2cos 𝜃
                                               2cos2 𝜃
        = 4cos𝜃 − 2cos𝜃 =2cos𝜃             =               = 2cos𝜃
                                                   cos𝜃
        ∴ 𝐿𝐻𝑆 = 𝑅𝐻𝑆
                                                                                                          (4)
5.4.1                  5 sin(A − B) = 3 sin(A + B)

          5 (sinA cosB – cosA sinB) = 3(sinA cosB + cosA sinB)                  expand sin(A − B)

        5 sinA cosB − 5cosA sin𝐵        = 3sinA cosB + 3cosA sinB               expand sin(A + B)

                       2 sinA cosB      = 8 cosA sinB
                                                                                simplify /
                                                                                 vereenvoudig
                        ∴ sinA cosB = 4 cosA sinB

                                                                                                          (3)
5.4.2   sin A cos B = 4 cos A sin B

             sin A = 4 cos A tan B                                              sin A = 4 cos A tan B
            tan A = 4 tan B                                                     tan A = 4 tan B
                       1                       1
        but tan B = 2          ∴ tan A = 4 ( 2 ) = 2                            2
                                                                                                           (3)
                                                                                                          [23]

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QUESTION /VRAAG 6
      SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                     DESCRIPTORS/                    Marks
                                                                  BESKRYWERS
6.1   𝑎 = 2                                                        2                               (1)
6.2                                                                shape / vorm
      Mark f only / Merk slegs vir f                               turning points / draaipunte
                                                                   𝑥 & 𝑦 intercepts /
                                                                    x & y afsnitte
                                            (30°; 2)
                              (0°; 1,732)

                                                              𝑓
        (−150°; −2)

                                                                                                    (3)
                         0)
6.3          2 cos(𝑥 − 30     = 2sin 𝑥

              cos(𝑥 − 300 ) = sin 𝑥

      sin [90 − (𝑥 − 300 )] = sin 𝑥
                                                                   co-function
                        0
              (− 𝑥 + 120 ) = 𝑥                                     𝑥 = (− 𝑥 + 1200 )

      1200 – 𝑥 = 𝑥       𝑜𝑓/𝑜𝑟          1200 – 𝑥 = 1800 – 𝑥

              2𝑥 = 1200 + 𝑘3600                                    2𝑥 = 1200 + 𝑘3600
                                                                    or/of
               𝑥 = 600 + 𝑘1800                                     𝑥 = 600 + 𝑘1800
                                                                   𝑥 = −1200 , 600
         ∴     𝑥 = −1200 ; 600
                                                                  OR
           OR
         cos(𝑥 − 300 ) = sin 𝑥

         cos (𝑥 − 300 ) = cos(90° − 𝑥)                                co-function
                 𝑥 − 30° = 90° − 𝑥
                                                                   𝑥 − 30° = 90° − 𝑥
                       2𝑥 = 1200 + 𝑘3600
                                                                   2𝑥 = 1200 + 𝑘3600
                       𝑥 = 600 + 𝑘1800                              or/of
                                                                   𝑥 = 600 + 𝑘1800
                   ∴    𝑥 = −1200 , 600                            𝑥 = −1200 , 600              (5)
6.4   k=3                                                             3                          (1)
6.5   𝑓 shifted 600 to the right                                   600
                                                                   to the right                  (2)
                                                                                                  [12]

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QUESTION /VRAAG 7
      SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD          DESCRIPTORS/                    Marks
                                                       BESKRYWERS

                              45                                           45
7.1   AC:       sin 430 =                                  sin 430 =
                              AC                                           𝐴𝐶
              AC 𝑠𝑖𝑛 430 = 45
                               45
                    AC =
                             sin 430
                    AC = 65,98 m                          Answer
                               45                                          45
      AD:        sin 500 =                                 sin 500 =
                              AD                                           𝐴𝐷

              AD sin 500 = 45
                                45
                    AD =
                             sin 500

                    AD = 58,74 m                          Answer                      (4)

7.2   CD2 = AC2 + AD2 – 2(AC)(AD)cos 𝐴                 using cos rule / gebruik van
                                                                         cos-reël
      CD2 = 65,982 + 58,742 – 2(65,98)(58,74)cos 690
                                                        substitution / substitusie
      CD = √5025,919618

      CD = 70,89 𝑢𝑛𝑖𝑡𝑠                                                                 (3)
                                                          Answer
                                                                                       [7]

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GEOMETRY/ MEETKUNDE

S: Statement/ Bewering
R: Reason/ Rede
S/R: Both Statement and Reason/ Beide Bewering en Rede

Allow for alternative methods/ Maak voorsiening vir alternatiewe metodes

 QUESTION /VRAAG 8
         SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                                        DESCRIPTORS/   Marks
                                                                                        BESKRYWERS
               
 8.1.1   CAB  x              [∠s opp = sides /∠𝑒 𝑡𝑒𝑒𝑛𝑜𝑜𝑟 = 𝑠𝑦𝑒. ]                      S/R            (1)

                                                                                       S
 8.1.2        A O B  2 x [∠ at centre = 2∠ at circumf / midpts ∠ = 2 omtreks ∠]        R              (2)

                      180  2 x
 8.2      B1                     [sums AOB & ∠s opp = sides /                        R
                           2
                                         𝑠𝑜𝑚 𝑒 𝐴𝑂𝐵 & ∠𝑒 𝑡𝑒𝑒𝑛𝑜𝑜𝑟 = 𝑠𝑦𝑒. ]
          
          B1  90  x                                                                   90° − 𝑥

               
          A M B  90                 [sums AMB / 𝑠𝑜𝑚 𝑒 AMB ]                       R              (3)

 8.3     AM = 6 𝑢𝑛𝑖𝑡𝑠             [line from centre ⊥ chord/ 𝑙𝑦𝑛 𝑣𝑎𝑛𝑎𝑓 𝑚𝑖𝑑𝑝𝑡 ⊥ 𝑘𝑜𝑜𝑟𝑑]   SR            (2)
                                                                                                        [8]

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QUESTION /VRAAG 9
        SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                                     DESCRIPTORS/   Marks
                                                                                    BESKRYWERS
9.1.1   tan-chord theorem/ raaklyn-koordstelling                                    R             (1)

9.1.2   angles opposite equal radii/sides / hoeke teenoor gelyke radii/ sye         R             (1)

9.2     AĈB = 90° [ in semi-circle/  in halwe sirkel]                             S/R
         AĈB = TO ̂A                                                              S
        CTOB is a cyclic quad/ is ’n koordevierhoek [ext  = opp int/             R
                                                    buite  = teenoorst. binne ]
        OR/ OF
        AĈB = 90° [ in semi-circle/  in halwe sirkel]                             S/R
         AĈB = TO ̂B                                                              S
        CTOB is a cyclic quad/ is ’n koordevierhoek [opp s supplementary/         R
                                                     teenoorst. e supplementêr]
        OR/ OF
                                                                                     S/R
        AĈB = 90° [ in semi-circle/  in halwe sirkel]
        OT̂A = 65°
                                                                                    S
                 ̂ C = 65° [s in ABC]
        and/ en OB
        CTOB is a cyclic quad/ is ’n koordevierhoek [opp s supplementary/         R
                                                     teenoorst. e supplementêr]
        OR/ OF
        AĈB = 90° [ in semi-circle/  in halwe sirkel]                             S/R
        OT̂C = 115° [ext  of /  buite van ]
                 ̂ C = 65° [s in ABC]
        and/ en OB                                                                  S
        CTOB is a cyclic quad/ is ’n koordevierhoek [ext  = opp int/             R
                                                    buite  = teenoorst. binne ]

                      ̂ 𝐊 as ext  / Kan ook 𝐂𝐁
        Can also use 𝐂𝐁                       ̂ 𝐊 as buite  gebruik
                                                                                                    (3)

9.3                                                                                SR
        COB = 50° [ at centre = 2 ×  at circumf./ middelpts  = 2 × omtr. ]
                                              OR
                    [ exterior ∠ of ∆ / 𝑏𝑢𝑖𝑡𝑒 ∠ van ∆]                                              (2)

          
9.4       K = 40° [s in ACK]                                                      S
          
         S = 50° [s in SOK]                                                      S
                 
         S = COB                                                                   S

        OK is a tangent / is ’n raaklyn [conv. tan-chord thm/ omg. raakl- koordst]  R             (4)
                                                                                                    [11]

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QUESTION /VRAAG 10
       SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                                DESCRIPTORS/        Marks
                                                                              BESKRYWERS
10.1
                             P

                                 k\

                                      h

                       S                         T

                   Q                                       R

                                                                               Constr/ Konstr
       Constr/ Konstr: Draw SR and TQ/ Trek SR en TQ
       Proof/ Bewys:                                                              Area ∆PST
                                                                                             =
                                                                                  Area ∆QST
                                                                              1
       Area ∆PST 12 PS×h   PS                                                 2
                                                                                PS×h
                =1       =    [equal altitudes ; 𝑔𝑒𝑙𝑦𝑘𝑒 ℎ𝑜𝑜𝑔𝑡𝑒𝑠]              1
                                                                                SQ×h
       Area ∆QST 2 SQ×h    SQ                                                 2

                                                                                  Area ∆PST
       Area ∆PST 12 PT×k   PT                                                 Area ∆STR
                =1       =    [equal altitudes ; 𝑔𝑒𝑙𝑦𝑘𝑒 ℎ𝑜𝑜𝑔𝑡𝑒𝑠]                   PS
       Area ∆STR 2 TR×k    TR                                                 =
                                                                                   SQ
       Area QST = Area STR [ same base, height;/ dieselfde basis, hoogte;   SR
                                                                ST||QR]

           Area ∆PST Area ∆PST                                                S
       ∴            =
           Area ∆QST Area ∆STR

           PS PT
       ∴     =                                                                                     (6)
           SQ TR

                                               13

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         SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                                  DESCRIPTORS/        Marks
                                                                                  BESKRYWERS
10.2

10.2.1   Ĉ2 = x     [alternate/ verw. s; EC || AD]                              S

         ̂
         E1 = x      [corresp./ ooreenk. s; EC||AD]                              S
                                                                                   any 1 correct R    (3)

10.2.2   BD     BA
              = AE       [line || to 1 side of / lyn || aan 1 sy van ] OR/ OF   SR
         DC
                        [Proportional Theorem/ Eweredigheidstelling; EC||AD]

           BD      BA
                                                                                   EA = AC
         ∴ DC = AC        [EA = AC; sides opp. equal s/ sye teenoor gelyke e]   R
                                                                                                        (4)
                                                                                                       [13]

                                                        14

### Page 15

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QUESTION /VRAAG 11
       SUGGESTED ANSWER/ VOORGESTELDE ANTWOORD                                     DESCRIPTORS/     Marks
                                                                                   BESKRYWERS

11.1   ̂ 1 = 𝑥 [tan-chord theorem/ raakl-koord stelling]
       D                                                                            SR
       ̂ 3 = 𝑥 [alt. s; AB || ED / 𝑣𝑒𝑟𝑤𝑖𝑠. 𝑒 ; AB||ED]
       D                                                                            SR
       ̂ 2 = 𝑥 [equal chords, equal angles / 𝑔𝑒𝑙𝑦𝑘𝑒 𝑘𝑜𝑜𝑟𝑑𝑒, 𝑔𝑒𝑙𝑦𝑘𝑒 ℎ𝑜𝑒𝑘𝑒.]
       D                                                                                             (6)
                                                                                    SR

11.2   In 𝛥DEA 𝑎𝑛𝑑 𝛥DBC
           1) ̂
              D1 = ̂D3 = 𝑥     [ proven / re𝑒𝑑𝑠 𝑏𝑒𝑤𝑦𝑠]                              S
                   ̂
           2) B2 = E           [ext.  of cycl.quad / 𝑏𝑢𝑖𝑡𝑒ℎ𝑜𝑒𝑘 𝑣 𝑘𝑣ℎ. ]            SR
                                                                                    S&R
              ̂1 = A
           3) C    ̂1           [s of ∆ / e van ∆]
           ∴ 𝛥DEA ||| 𝛥DBC     [,,]
          OR
       In 𝛥DEA 𝑎𝑛𝑑 𝛥DBC
           1) ̂
              D1 = ̂D3 = 𝑥     [ proven / re𝑒𝑑𝑠 𝑏𝑒𝑤𝑦𝑠]                              S
                   ̂
           2) B2 = E           [ext.  of cycl.quad / 𝑏𝑢𝑖𝑡𝑒ℎ𝑜𝑒𝑘 𝑣 𝑘𝑣ℎ. ]            SR
           ∴ 𝛥DEA ||| 𝛥DBC     [,,]                                              S&R            (4)

11.3   DE EA                                                                        SR
         =                   [ 𝛥DEA ||| 𝛥DBC ]
       DB BC

       ∴ DE. BC = EA. DB
       AB = BD       [equal sides opp equal s ; / gelyke sye teenoor gelyke e]    SR
       AB = AE       [given / gegee]
       ∴ BD = AE                                                                    S

       ∴ DE. BC = EA. EA                                                                            (5)

11.4   ̂ 1 + 3𝑥
       A          = 180°       [opp s of cycl quad. / 𝑡𝑒𝑒𝑛𝑜𝑜𝑟𝑠𝑡. 𝑒 𝑣𝑎𝑛 𝑘𝑣ℎ]       SR
       75° + 3𝑥 = 180°
             3𝑥 = 105°
                                                                                     Answer/
              𝑥 = 35°                                                                                (3)
                                                                                    Antw
                                                                                                     [18]
                                                                                Total/Totaal: 150
                                                 15

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