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UI Post-UTME Mathematics 2022 (Model questions) Question 2

Question 2

Mensuration of Solids

The curved surface area of a cylinder 7cm high is 140cm2. Find the radius of its base (π = 22/7)

  1. A.3.18cm
  2. B.1.59cm
  3. C.6.36cm
  4. D.4.77cm
Show the answer and explanation

Answer: A (3.18cm)

Explanation

2πrh = 140 gives r = 140 ÷ (2 × 22/7 × 7) = 140 ÷ 44 ≈ 3.18 cm.