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Question

A metal pipe is $77$ cm long. The inner diameter of a cross section is $4$ cm, the outer diameter being $4.4$ cm. Find its inner curved surface area.

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Solution

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Inner curved surface area

$= 2 π r h$

$= 2 \times π \times \frac{4}{2} \times 77$

$= 968 c m^{2}$

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