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The radius of a hemispherical balloon ...

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

A

`1:4`

B

`1:3`

C

`2:3`

D

`2:1`

Text Solution

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The correct Answer is:
A, D
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