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WAEC Mathematics 2018 Question 13

Question 13

Mensuration of Solids

The volume of a cylindrical tank, 10m high is 385m3. Find the diameter of the tank. [Take π = 22/7]

  1. A.14m
  2. B.10m
  3. C.7m
  4. D.5m
Show the answer and explanation

Answer: C (7m)

Explanation

22/7 × r² × 10 = 385 gives r² = 12.25, r = 3.5 m, so the diameter is 7 m.