Q24 of 189 Page 508

A hemispherical bowl is made of steel 0.5 cm thick. The inside radius of the bowl is 4 cm. Find the volume of steel used in making the bowl.

Given,


In-radius of bowl (ri) = 4 cm


Thickness of steel = 0.5 cm


External radius of bowl (re)= 4 + 0.5 = 4.5 cm


Volume of metal = πre3 – ri3


= (re3 – ri3) = 3 – 43) =


= = 56.83 cm3


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