ECZ 2020 · O-Level Paper 1 — Circle Theorems
In the diagram, P, Q, R, S and T lie on a circle, TQ = TR, PR is parallel to TS, angle TQR = 70° and angle TRP = 20°. Find (b) angle RST.
- A. 70°
- B. 40°
- C. 90°
- D. 110°
Verified working — step 1
RQTS is a cyclic quadrilateral, so opposite angles angle RST and angle RQT add to 180°: angle RST = 180° - 70° = …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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