ECZ 2019 · GCE Paper 1 — Mensuration
The diagram shows a sector of a circle with centre O and radius 4.2 cm. Angle AOB = θ. Given that the area of the sector AOB is 9.24 cm², find the value of θ. [π = 227]
- A. 30°
- B. 120°
- C. 60°
- D. 45°
Verified working — step 1
Area = (θ/360) × πr² = (θ/360) × (227) × 4.2² = (θ/360) × 55.44. Setting this equal to 9.24: θ/360 = 9.2455.44= 16, so θ = …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.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question