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in Surface Areas And Volumes by (65.5k points)

A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.

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In a hemispherical tank, 

Inner radius, r1 = 1 m 

Outer radius, r2 = 1 + 0.01 = 1.01 m (∵ 1 cm = 0.01) 

∴ Volume of hemispherical tank, V 

= Volume of outer diameter – Volume of inner diameter.

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