ECZ 2019 · GCE Paper 1 — Circle Theorems
In the diagram below, A, B, C, D and E are points on the circumference of the circle with centre O. DE = AD, AĈB = 20° and AÔE = 80°. Find AD̂E.
- A. 80°
- B. 40°
- C. 20°
- D. 60°
Verified working — step 1
Angle AOE sits at the CENTRE and angle ADE at the circumference, and both stand on the same arc AE - the setup for the angle-at-the-centre theorem.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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