ECZ 2021 · O-Level Paper 1 — Circle Theorems
The points A, B, C and D are on the circumference of a circle centre O, such that angle AOC = 126°. AO is parallel to DC and angle OCB = 33°. Find (c) BAO.
- A. 30°
- B. 27°
- C. 33°
- D. 57°
Verified working — step 1
Angle BAO is a difference of two angles at A: the whole angle BAC minus the slice OAC. Build each from an isosceles triangle.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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