ECZ 2010 · O-Level Paper 1 — Circle Theorems
Using the same diagram, calculate angle PUS.

- A. 42°
- B. 66°
- C. 24°
- D. 114°
Verified working — step 1
Angle QPT = 24° (isosceles triangle PQT) and angle PQS = angle QST = 42° (alternate angles). In triangle PQU, angle PUS is the exterior angle, so it equals 24 + 42 = …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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