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Question

Total surface area of a cylinder of radius r and height h is 
  1. 2πr2+4πrh
  2. 2πr2+2πrh
  3. 2πrh


Solution

The correct option is B 2πr2+2πrh
A cylinder has two circular flat surfaces and a curved surface.

As r is the radius of the cylinder the area of a flat surface is
πr2. Therefore, the area of two flat surfaces is
2×πr2=2πr2.

The area of the curved surface is =2πr×h=2πrh
as the height of the cylinder is h.

Hence, the total surface area the cylinder is =2πr2+2πrh.

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