A metal pipe is 77 cm. long. The innes diameter of a cross section is 4cm..,the outer diameter being 4.4 cm. (see figure) Find its
(1)inner curved surface area
(2) outer curved surface area
(3)Total surface area.
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inner curved surface area=2π×2×77=2×22/7×2×77
= 2×22×2×11= 967
outer curved surface area=2×22×2.2×11=1064.8
total surface area=2031.8
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