The lateral surface area of a right circular cylinder with base diameter $28 c m$ and height $20 c m$ is

1760 cm

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1780 cm²

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1280 cm²

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1000 cm²

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Solution

The correct option is D: $1760 c m^{2}$
Given: Diameter $= 28 c m$
Radius $(r) = 14 c m,$ height $(h) = 20 c m$
Let S denotes the lateral surface area.
$S = 2 π r h$
$\Rightarrow S = 2 \times \frac{22}{7} \times 14 \times 20 c m^{2}$
$\Rightarrow S = 44 \times 2 \times 20 c m^{2}$
$∴ S = 1760 c m^{2}$

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