ECZ 2013 · O-Level Paper 1 — Circle Theorems
A circle centre O passes through the points A, B, C and D. Angle AOC = 110 degrees and AO is parallel to BC. Find angle OCA.
- A. 35 degrees
- B. 55 degrees
- C. 70 degrees
- D. 110 degrees
Verified working — step 1
OA and OC are radii, so triangle AOC is isosceles. The base angles are equal: 180 - 1102= …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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