ECZ 2018 · O-Level Paper 1 — Trigonometry

In the diagram below, AC = 10 cm, angle ABC = 90° and angle BAC = 30°. Calculate BC.

Verified working — step 1

BC sits OPPOSITE the 30° angle, and AC is the hypotenuse - the pairing that calls for sine.

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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