ECZ 2019 · GCE Paper 1 — Similarity and Congruency
The ratio of the volumes of two similar solids is 64 : 27. The surface area of the smaller solid is 180 cm2. What is the surface area of the bigger solid?
- A. 405 cm2
- B. 240 cm2
- C. 426⅔ cm2
- D. 320 cm2
Verified working — step 1
Route every similar-solids ratio through LENGTHS: cube-root the volume ratio down to lengths, then square up to areas.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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