The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is

Lalit Singh • 4.06K Points
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Q. The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is

(A) 1 : 4
(B) 1 : 3
(C) 2 : 3
(D) 2 : 1

Correct Answer - Option (A)

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