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A hollow cylindrical pipe is 21cm long. If its outer and inner diameters are 10cm and 6cm respectively, then the volume of the metal used in making the pipe is (take )

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1048cm3

1056cm3

1060cm3

1064cm3

answer is B.

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Detailed Solution

Pipe is in shape of hallow cylinder;
Volume of a hollow cylinder of outer radius “R”
Inner radius “r”, height “h” ⇒ π(R2 −r2)h
Outer radius =

Inner radius =

’
Volume of pipe =

= 1056cm3
Therefore; option (B) is correct answer.

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