ECZ 2025 · O-Level Paper 1 — Symmetry
The diagram shows a circle with centre O and six identical triangles. Triangle BOC is shaded. Name two other triangles that should be shaded so that the figure has rotational symmetry of order 3 about O.
- A. Triangles AOB and COD
- B. Triangles AOF and DOE
- C. Triangles COD and EOF
- D. Triangles AOB and EOF
Verified working — step 1
Rotational symmetry of order 3 means the figure matches itself after each rotation of 120° about O.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