ECZ 2023 · O-Level Paper 1 — Circle Theorems
In the following diagram, A, B, C, D and E lie on the circumference of a circle centre O. BD = BE, angle CAD = 18° and angle BEC = 51°. Find (a) angle ADC.
- A. 69°
- B. 18°
- C. 90°
- D. 51°
Verified working — step 1
AC passes through the centre O, so AC is a diameter.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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