ECZ 2017 · GCE Paper 1 — Mensuration
The curved surface area of a cone is 88 cm². Given that the base radius is 4 cm, calculate the slant height of the cone. [π = 227, A = πrl]
- A. 3.5 cm
- B. 14 cm
- C. 22 cm
- D. 7 cm
Verified working — step 1
A = πrl: 88 = (227) × 4 × l = (887)l, so l = 88 × 788= …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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