The radius of hemispherical balloon incr...

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

A

`1 : 4`

B

`1 : 3`

C

`2 : 3`

D

`1 : 2`

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The correct Answer is:

A

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