ECZ 2019 · GCE Paper 1 — Trigonometry
The diagram shows triangle KLM in which KL = 16 cm, angle KLM = 150° and its area is 32 cm2. Calculate the length of LM.
- A. 4 cm
- B. 8 cm
- C. 16 cm
- D. 2 cm
Verified working — step 1
The area rule Area = 12 × a × b × sin C uses the two sides that SANDWICH the angle - and the sine of an obtuse angle is positive: 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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