The radius of a spherical balloon, which was bearing slogan against child labour, increases from 7cm to 14cm as air is being pumped into it. Find the ratio of surface area of the balloon in two cases. How does child labour affect the development of the society?
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Answer:
The surface area of balloon with radius 7cm
Surface area=4πr^2
=4×22/7×7×7
=616cm^2
The surface area of Balloon with radius 14cm
Surface area=4πr^2
=4×22/7×14×14
=1232cm^2
Ratio of their surface areas
surface area of balloon with radius 7cm÷surface area of balloon with radius 14cm
=616/1232
=1/4
=1:4
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