The radius of a spherical balloon increases from 7 cmn to 14 cm as air is being pun
into it. Find the ratio of surface areas of the balloon in the two cases.
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surface area of small balloon=4πr^2
4*22/7*7^2=616cm^2
surface area of large balloon=4πr^2
4*22/7*14^2=2464cm^2
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