ECZ 2021 · GCE Paper 1 — Similarity and Congruency
The areas of the faces of cubes A and B are 9cm² and 25cm² respectively. Find the ratio of their volumes.
- A. 9:25
- B. 3:5
- C. 27:125
- D. 81:625
Verified working — step 1
Face areas 9 and 25 give side lengths 3 and 5, so the length ratio is 3:5. Volumes scale as the cube of the length ratio: 3³:5³ = …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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