ECZ 2019 · GCE Paper 1 — Circle Theorems
In the diagram below, A, B, C, D and E are points on the circumference of the circle with centre O. DE = AD, AĈB = 20° and AÔE = 80°. Find BÂD.
- A. 50°
- B. 70°
- C. 90°
- D. 30°
Verified working — step 1
Work in ARCS: every circumference angle is half the arc it stands on, so build up the arcs one theorem at a time.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