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3. A metal pipe is 77\( \mathrm { cm } \) long. The inner diameter of a cross section is 4\( \mathrm { cm } \) , the outer diameter being 4.4\( \mathrm { cm } \) (see Fig. \( 13.11 ) . \) Find its (i) inner curved surface area (ii) outer curved surface area. (ini) total surface area 13.4\( \mathrm { Sur } \) So far, we
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