Mathematics · Mensuration

A solid hemisphere has a radius of 21 cm. It is melted to form a cylinder such that the ratio of its curved surface area to its total surface area is 2 : 5. What is the radius (in cm) of the base of the cylinder? (Take π = 22 7 )

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A solid hemisphere has a radius of 21 cm. It is melted to form a cylinder such that the ratio of its curved surface area to its total surface area is 2 : 5. What is the radius (in cm) of the base of the cylinder? (Take &pi; = 22 7 )