ECZ 2013 · O-Level Paper 1 — Circle Theorems
A circle centre O passes through the points A, B, C and D. Angle AOC = 110° and AO is parallel to BC. Find angle ABC.
- A. 55°
- B. 110°
- C. 125°
- D. 145°
Verified working — step 1
B sits on the MAJOR arc, so the angle at B stands on the reflex angle at the centre, not the marked 110°.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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