Question

A hollow cylinder copper pipe is 7dm long it outer and inner diameter are 12cm 8 respectively find the volume of the copper used in making the pipe

Answer 1

Let outer diameter be=>R

Let inner diameter be=>r

Volume of cyclinder =πr^2h

but,here= π{(R^2)-(r^2)}h

=> 22/7×{(6)^2-(4)^2}70

=>22/7×{36-16}×70

=>22×20×10

=>4400g