The radius of a spherical balloon increases from 7 cm to 14 cm as air us being pumped into it . find the ratio of surface areas of the ball on in the two cases.
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it is very simple
ratio=c1/C2
= 4πr1square/4πr1square
=r1square/r2 square
=49/196
=49:196 is ur answer
ratio=c1/C2
= 4πr1square/4πr1square
=r1square/r2 square
=49/196
=49:196 is ur answer
akhileshsharma2:
well come baby
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