ECZ 2018 · GCE Paper 1 — Similarity and Congruency
The ratio of the heights of two containers that are geometrically similar is 2 : 3. If the surface area of the smaller container is 80 cm2, find the surface area of the larger container.
- A. 120 cm2
- B. 270 cm2
- C. 180 cm2
- D. 360 cm2
Verified working — step 1
Heights are lengths, and similar solids scale AREA by the SQUARE of the length ratio - the cube is for volumes.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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