ECZ 2017 · GCE Paper 1 — Trigonometry
The diagram shows triangle ABC in which AC = 18 cm, CÂB = 30° and AB̂C = 90°. Calculate the length of BC.
- A. 15.6 cm
- B. 9 cm
- C. 36 cm
- D. 10.4 cm
Verified working — step 1
BC is opposite the 30° angle and AC = 18 is the hypotenuse: BC = 18 × sin 30° = 18 × ½ = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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