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
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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
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
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