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JAMB Mathematics 1979 Question 37

Question 37

Mensuration of Solids

A cylinder of height h and radius r is open at one end. Its surface area is

  1. A.2πrh
  2. B.πr2h
  3. C.2πrh + 2πr2
  4. D.πrh + πr2
  5. E.2πrh + πr2.
Show the answer and explanation

Answer: E (2πrh + πr2.)

Explanation

The curved surface is 2πrh and only one circular end is closed, adding πr².