Question

The thickness of a metallic pipe is 1 cm. its inner diameter is 12 cm. what is the volume of metal needed for a pipe of length 1m?

Answer 1

Volume of metal need for pipe

=> volume of cylinder hollow pipe
=. π R ^2 - R ^ 2


=> R = 6 cm



volume = 22 / 7 ( 49-36 ) . 100

=> 22/ 7 * 13 *100 = cm ^3

Answer 2

Inner radius=1/2 of diameter =1/2 × 12=6cm...(r)
Radius of the pipe= 6+1=7cm...(R)
Volume of metal=πh(R²-r²)=22/7×100(7²-6²) =22/7×100×13=4085.7 cm³
I HOPE THIS ANSWER IS RIGHT