3. A rectangular piece of paper of dimensions 20 cm x 14 cm is rolled along the breadth to form a
cylinder. Find the radius of the base of the cylinder so formed.
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Area of rectangle = Area of a cylinder
l × b = 2 × pi × r × h
20 × 14 = 2 × 22/7 × r × 20
20 × 14 × 7 = 2 ×22 × r × 20
r = 20 × 14 × 7 / 2 × 22 × 20
r = 14 × 7 / 2 × 22
r = 7 × 7 / 22
r = 49 /22
r = 2.2 cm
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