ECZ 2018 · GCE Paper 1 — Mensuration
The diagram below shows a sector AOB of a circle with centre O and radius 7 cm. The area of the sector is 25⅔ cm2. [π = 227] Calculate AÔB.
- A. 30°
- B. 120°
- C. 60°
- D. 45°
Verified working — step 1
A sector with centre angle θ is θ/360 of the full circle - and turning 25⅔ into the improper fraction 773 makes the algebra clean.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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