ECZ 2015 · O-Level Paper 1 — Circle Theorems
In the diagram, A, B, C and D are points on the circumference of a circle with centre O. ADE and BCE are straight lines, angle CED = 28° and angle BCA = 43°. Find angle CDB.
- A. 75°
- B. 43°
- C. 15°
- D. 105°
Verified working — step 1
Move the target to angle CAB first - angle CDB stands on the same arc BC, so it will match.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.
Have a different question?
Search it — if it is from a past paper or a school mock, chances are we have it worked out, or one that uses the same method.
Search any past-paper question