Mensuration-9

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A memorial is in the form of a cylinder surmounted by a hemisphere. The diameter of
the sphere is 20 m and the total height of the memorial is 28 m. Find the surface area.

Solution: The curved surface area of the cylindrical portion = 2 π r h

= 2 x 22/7 x 10 x 28 sq. m

= 1760 sq. m

The surface area of the hemisphere = 2 π r2

= 2 x 22/7 x 10 x 10

= 4400/7 sq. m

The surface area of the memorial = 1760 + 4400/7 = 2388-4/7 sq. m

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