9. Exercise Problems VI

A hemispherical tank is made up of an iron sheet $1cm$ thick. If the inner radius is $1 m$, then find the volume of the iron used to make the tank. (Assume $π =\frac{22}{7}$)

Required volume is $0.02365 m^3$$0.01256 m^3$$0.06348 m^3$$0.65264 m^3$