a cylindrical metal pipe 1m long has an outer diameter of 7.2cm and an inner diameter of 2.8cm. Find the volume of metal used for the cylinder

Answer Details

Volume of cylinder pip (V) = π $\pi$h(R2 ${}^2$ - r2 ${}^2$)

= 100π $\pi$(7.22 ${}^2$ - 2.82 ${}^2$)

= 100π $\pi$(51.84 - 7.84)

= 100π $\pi$ x 44

= 440π $\pi$cm3