ECZ 2018 · O-Level Paper 1 — Circle Theorems
In the diagram below, O is the centre of the circle. A, B, C and D are points on the circumference. AD produced meets the line from C at E such that CD = DE and angle AOC = 120°. Calculate angle (a) ADC.
- A. 120°
- B. 30°
- C. 60°
- D. 90°
Verified working — step 1
Angle AOC = 120° is the angle at the centre standing on chord AC.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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