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 (b) BCD.

Verified working — step 1

BD = AD, so triangle ABD is isosceles.

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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