A rectangular sheet of paper 22cm X 15 cm is rolled along its length to form a hollow cylinder. The radius of the cylinder is

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11 cm

3.5 cm

7 cm

15 cm

answer is D.

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Detailed Solution

Circumference of cylinder base = 22 cm
$\begin{array}{l} 2 πr = 22 \\ 2 \times \frac{22}{7} r = 22 \\ r = 22 \times \frac{1}{2} \times \frac{7}{22} \\ r = \frac{7}{2} cm = 3 .5 cm \end{array}$

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