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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(i) inner curved surface area,(ii) outer curved surface area,(iii) total surface area

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1) Inner surface area=`2pirh`
2) Outer surfacce area=`2pirh`
3) Total surface area=outer surface area+inner surface area+ring.

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