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d=2 so,
r=1 now
volume=h x pi x r²
hence volume=40 x 3.14 x 1² 
⇒125.6cubicinches  Q.E.D
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Volume = πr^2h.
therefore volume of given cylinder=40*(2/2)^2*(22/7)
                                               =125.6 cubic inches.
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