Mensuration-49

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Find the surface area and volume of a hemisphere made of stone and radius 10 cm.

Solution: Total surface area = surface area of spherical portion + area of circular portion

= 1/2 x 4 Π r2 + Π r2 = 3 Π r2

= 3 x 3.14 x 10 x 10 cm = 942 cm2

Volume of the hemisphere = 1/2 x 4/3 Π r3 = 2/3 x 3.14 x 103 = 2093.3 cm3

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