ECZ 2023 · O-Level Paper 1 — Mensuration

The curved surface area of a cone with radius 4.2cm is 138.6cm2. Find its slant height. [π = 227]

  • A. 10.5cm
  • B. 21cm
  • C. 33cm
  • D. 4.2cm

Verified working — step 1

Curved surface area = πrl

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Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.

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