ALTERNATIVE ANSWERS TO SOME QUESTIONS_hlayiso.com_.pdf

Downloaded from hlayiso.com ALTERNATIVE METHODS TO SOME QUESTIONS/ ALTERNATIEWE METODES TOT SEKER VRAE 3.2.4 𝐴𝐶 = √260 = 2√65 𝐴𝐵 = √160 = 4√10 ✓𝐴𝐵 = √160 = 4√10 𝐵𝐶 = √50 = 5√2 ✓ 𝐵𝐶 = √50 = 5√2 260 ≠ 160 + 50 ✓ 260 ≠ 160 + 50 𝐴𝐶 2 ≠ 𝐴𝐵2 + 𝐵𝐶 2 (3) 3.2.7 𝐴𝐷 = 10,08 ✓ 𝐴𝐷 = 10,08 𝐴𝐸 = 10,54 ✓𝐴𝐸 = 10,54 1 ✓ Formula/formule 𝐴𝑟𝑒𝑎 𝑜𝑓 ∆ 𝐴𝐷𝐸 = 𝐴𝐷. 𝐴𝐸 sin 𝐴 2 1 ✓ substitution/vervanging 𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐴𝐷𝐸 = (10,08)(10,54) sin 25,56 2 𝐴𝑟𝑒𝑎 𝑜𝑓 ∆𝐴𝐷𝐸 = 22,92 𝑢𝑛𝑖𝑡𝑠 2 ✓answer/antwoord (5) 4.5 sin 5𝜃 = cos(𝜃 − 40) cos(90 − 5𝜃) = cos(𝜃 − 40) ✓ co -function /ko-funksie 90 − 5𝜃 = 𝜃 − 40 90 − 5𝜃 = 𝜃 − 40 + 360𝑘 ✓ −6𝜃 = −130 + 360𝑘 −6𝜃 = −130 + 360𝑘 𝜃 = 21,67 − 60𝑘 ✓ 𝜃 = 21,67 − 60𝑘 OR / OF ✓90 − 5𝜃 = 360 − (𝜃 − 90 − 5𝜃 = 360 − (𝜃 − 40) + 360𝑘 40) + 360𝑘 −4𝜃 = 310 + 360𝑘 ✓−4𝜃 = 310 + 360𝑘 𝜃 = −77,5 − 90𝑘 ✓ 𝜃 = −77,5 − 90𝑘 (6) CORRECTIONS TO BE MADE ON THE QUESTION PAPER (ENGLISH AND AFRIKAANS VERSION Re-phrasing of the question. Question 9.1 Calculate, in terms of 𝑥 and 𝑦, the sizes of the following angles. Give reasons for your answers. Vraag 9.1 Bereken, in terme van 𝑥 en 𝑦, die groottes van elk van die volgende hoeke. Gee redes vir jou antwoorde. CORRECTIONS ON MARKING GUIDELINE 10.3 - Delete one “e” in the second line ( highlighted in the marking guideline)