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Question

The curved surface area and the total surface area of a hemisphere of radius 7 cm will be


A

308 cm2 and 462 cm2 respectively

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B

318 cm2 and 480 cm2 respectively

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C

310 cm2 and 452 cm2 respectively

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D

328 cm2 and 562 cm2 respectively

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Solution

The correct option is A

308 cm2 and 462 cm2 respectively


Given, r = 7 cm

The curved surface area =2πr2
=2×227×72
=308 cm2

The total surface area of the hemisphere =3πr2
=3×227×72
=462 cm2


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