Q30 of 70 Page 21

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.

Volume of a hemisphere = (2/3)πr3


Volume of material = (2/3)π × (r03 – ri3)


Given, hemispherical tank is made up of an iron sheet 1 cm thick and the inner radius is 1 m


⇒ r0 = 1 + 0.01 = 1.01 m


Volume of iron used


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