Question

A hemi-spherical bowl is made of steel which is 0.5 cm thick. The inner radius of the bowl is 4cm. Find the volume of steel used in making the bowl.

Answer 1

Inner radius = 4cm

outer radius = 4+0.5 = 4.5cm

volume of steal = 4/3π(4.5³-4³)/2 = 2/3π(91.125 - 64) =2/3π(27.125) = 56.78