The diameter of a cylinder is $28$ cm and its height is $20$ cm find the curved surface area.

1760

sq.cm

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17600

sq.cm

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1706

sq.cm

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none of these

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Solution

The correct option is A $1760$ sq.cm
Diameter of the cylinder $= 28$ cm

$∴$ Radius of the cylinder $= r = \frac{28}{2} = 14$ cm

Height of the cylinder $= h = 20$ cm

Curved surface area $= 2 π r h = 2 \times \frac{22}{7} \times 14 \times 20 = 1760$ sq.cm

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