7Q Volume of material used to make a pipe of inner and outer radius r and R and lenth of pipe is h is
πr2h
Π(R2-r2)h
4/3π(R-r)h
None
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The 2nd option is correct.
pi ( R^2 - r^2) h
:)
pi ( R^2 - r^2) h
:)
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