ECZ 2016 · O-Level Paper 1 — Trigonometry
The diagram below shows triangle PQR in which PQ = 12 cm, QR = 10 cm and ∠PQR = 150°. Calculate the area of triangle PQR.
- A. 30 cm2
- B. 60 cm2
- C. 120 cm2
- D. 52 cm2
Verified working — step 1
The area rule Area = 12 × a × b × sin C uses the two sides that SANDWICH the angle - and sin 150° = sin 30° = 12.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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