# 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

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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*22/7*77*2
=968cm^2
2) Outer surfacce area=2pirh
=2*22/7*2.2*77
=10647.8cm^2
3) Total surface area=outer surface area+inner surface area+ring.
=968+1064.8+pi(R^2+r^2)
=2032.8+22/7(4.4^2-4^2)
=2034.36cm^2