(1) The radius of a sphere is R. Find the ratio of its surface area to the area of a circle of the same radius.
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Here it is!
Area of circle=πr^2
Surface area of sphere =4πr^2
Surface area of sphere\area of circle
4πr2/πr^2
4/1
=4:1
Hence, the ratio of surface area of sphere to the area of the circle is 4:1
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