ECZ 2023 · GCE Paper 1 — Circle Theorems
In the diagram, A, B, C and D are points on the circumference of a circle with centre O. BD = AD and angle ADB = 40°. Find (a) AOB.
- A. 40°
- B. 140°
- C. 80°
- D. 70°
Verified working — step 1
angle ADB = 40° stands on chord AB.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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