Correct Answer: Option A

Explanation

V = πl(R\(^2\) - r\(^2\))

Divide both sides by πl

\(\frac{V}{πl}\) = (R\(^2\) - r\(^2\))

R\(^2\) = \(\frac{V}{πl}\) + r\(^2\)

Take the square root of both sides

R = \(\sqrt{\frac{V}{πl} + r^2}\)

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