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

$(a) 880 c m^{2} (b) 1760 c m^{2} (c) 3520 c m^{2} (d) 2640 c m^{2}$

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Solution

ANSWER:(b) 1760 $c m^{2}$
Curved surface area of the cylinder = 2πrh
=2× $\frac{22}{7}$ × 14 × 20

= 1760 $c m^{2}$

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