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WAEC Mathematics 2016 Question 16

Question 16

Mensuration of Solids

The curved surface area of a cylinder 5 cm high, is 110 cm2. Find the radius of its base. [Take π = 22/7]

  1. A.2.6 cm
  2. B.3.5 cm
  3. C.3.6 cm
  4. D.7.0 cm
Show the answer and explanation

Answer: B (3.5 cm)

Explanation

2πrh = 110: 2 × 22/7 × r × 5 = 110, so r = 3.5 cm.