ECZ 2021 · O-Level Paper 1 — Mensuration

The diagram below shows a sector AOB with centre O and radius 21cm. The angle subtended at the centre is θ and the area of the sector is 462cm2. Calculate the value of θ. [π = 227]

Diagram for ECZ 2021 · O-Level Paper 1
  • A. 240°
  • B. 90°
  • C. 120°
  • D. 60°

Verified working — step 1

Area = (θ/360°) × πr2

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

More Mensuration questions from past papers