The radii of two spheres are in the ratio of 1:2.What is the ratio of two surface areas?
Surface area of 1st sphere=4πr1²
Surface area of 2nd sphere=4πr2²
Ratio=r1²/r2²=1/4=1:4
The total surface area of a hemisphere of diameter 14cm is
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Find the volume of a hemisphere whose radius is 21cm.