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Question

The total surface area of a hemisphere having radius r is _____ .

A
4πr2
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B
3πr2
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C
2πr2
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D
52(πr2)
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Solution

The correct option is B 3πr2

We know that, surface area of a sphere of radius r is 4πr2.
Hence, the curved surface area of the hemisphere is 2πr2.
The area of the flat circular surface of radius r is πr2.

Hence, the total surface area of the hemisphere
=2πr2+πr2=3πr2

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