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The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it.

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The radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.

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Radius of spherical balloons be r1 and r2, r1 = 7 cm. and r2 = 14 cm. 

Ratio of surface area

∴ Ratio of surface areas of the balloons = 1 : 4.

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