The radius of a spherical ballon increase from 6cm to 12cm as air is being pumped into it .find the ratio of the surface area of the balloon in two case
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Surface area of sphere = 4×pi×r^2
so ratio of S.A of 1 to 2 is
6^2/12^2
36/144
=1/4
so ratio of S.A of 1 to 2 is
6^2/12^2
36/144
=1/4
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