ECZ 2020 · O-Level Paper 1 — Symmetry
The diagram is a right triangular pyramid ABCD with AB = BC = CA. What is the order of rotational symmetry of the pyramid about OD?
- A. 3
- B. 1
- C. 2
- D. 6
Verified working — step 1
The base ABC is an equilateral triangle, so rotating the pyramid about the axis OD throu…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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