Q23 of 189 Page 512

If the diameter of a cylinder is 28 cm and its height is 20 cm, then its curved surface area is

Curved surface area of a cylinder =


Diameter = 28 cm ⇒ radius = 14 cm


⇒ Curved surface area = 2× × 14 × 20


= 44 × 40 =1760 cm2

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