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Volume of cylinder - class-IX

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Multiple Choice

The volume, V $cm^{2}$, of a hollow cylindrical pipe of length $l$ cm, outer radius R cm and inner radius r cm is given by the formula : $V, =, \pi, (R^{2}, -, r^{2})., l$

Find r, if $V, =, 22,, R, =, 2,, l, =, 4$ and $\pi,, 3\displaystyle \frac{1}{7}.$

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