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WAEC Mathematics 1992 Question 15

Question 15

Mensuration of Solids

The curved surface area of a cylinderical tin is 704cm2. Calculate the height when the radius is 8cm. (Take π = 22/7)

  1. A.3.5cm
  2. B.7cm
  3. C.14cm
  4. D.28cm
  5. E.32cm
Show the answer and explanation

Answer: C (14cm)

Explanation

Curved surface area = 2πrh, so 2 × 22/7 × 8 × h = 704, giving h = 704 × 7 ÷ 352 = 14 cm.