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Volume of Hemisphere

A solid is in...

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A solid is in the form of the cone mounted on the hemisphere is such a way that the center of the base of the cone just coincide with the center of the base of the hemisphere .Slant height of the cone is L and radius of the base of the cone is 1/2 r ,where r is the radius of the hemisphere .Prove that the total surface area of the solid is pi / 4 11r + 2l r square units.

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