ECZ 2020 · GCE Paper 1 — Circle Theorems

In the diagram below, A, B, C, and D lie on the circumference of the circle, centre O. Given that ∠BAD = 47° and ∠DBC = 28°, calculate (b) ∠OBD.

Verified working — step 1

OB = OD because both are radii.

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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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