when all three - dimensional figure have two surface areas i.e lateral surface and total surface areas. why sphere has only one surface area explain?
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Archimedes first derived this formula from the fact that the projection to the lateral surface of a circumscribed cylinder is area-preserving. ... The sphere has the smallest surface area of all surfaces that enclose a given volume, and it encloses the largest volume among all closed surfaces with a given surface area. so earth has only one surface area .
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