the diameter of a spherical balloon increases from 14c.m to 28 c.m as air is being pumped into it . find the ratio of surface areas of the balloons in the two cases.
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surface of sphere=4πr2
sa1/sa2=4×π×7×7/4×π×14×14
=1/4,so ratio=1:4
sa1/sa2=4×π×7×7/4×π×14×14
=1/4,so ratio=1:4
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