ECZ 2015 · O-Level Paper 1 — Circle Theorems
In the diagram, A, B, C and D are points on the circumference of a circle with centre O. ADE and BCE are straight lines, angle CED = 28° and angle BCA = 43°. Find angle DAC.
- A. 15°
- B. 28°
- C. 43°
- D. 62°
Verified working — step 1
Angles on the straight line BCE give angle ACE = 180° − 43° = 137°. In triangle ACE, angle CAE = 180° − (137° + 28°) = 15°. D lies on the line AE, so angle DAC = angle CAE = …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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