ECZ 2019 · O-Level Paper 1 — Mensuration

The diagram below shows a sector AOB. Arc AB subtends an angle of 21° at the centre O. Given that the area of the sector is 14.85 cm², calculate the radius. [π = 227]

Verified working — step 1

Area = (θ/360°) × πr²

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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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