If the diameter of a cylinder is 28 cm and its height is 20 cm, then its curved surface area is
(a) 880 cm²
(b) 1760 cm²
(c) 3520 cm²
(d) 2640 cm²

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Solution

(b) 1760 cm²

$Curved surface area of the cylinder = 2 πrh = 2 \times \frac{22}{7} \times 14 \times 20 = 44 \times 40 = 1760 {cm}^{2}$

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