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Question

The volume of a hollow cylinder of inner radius r2, outer radius r1 and height h is ______ .

A
π(r21r22)
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B
πh(r21r22)
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C
πh(r1r2)
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D
πh(2r21r22)
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Solution

The correct option is B πh(r21r22)

In case of hollow cylinder, we measure two radius, one for inner circle and one for outer circle formed by the base of hollow cylinder.
Suppose, r1 is the outer radius and r2 is the inner radius of the given hollow cylinder with h as the height, then the volume of this cylinder can be written as πh(r21r22) .


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