3.
A metal pipe is 77 cm long. The inner diameter of a cross
section is 4 cm, the outer diameter being 4.4 cm
(see Fig. 13.11). Find its
(1) inner curved surface area,
(ii) outer curved surface area,
(iii) total surface area.
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Answer:
inner curved surface area =area of cross section of pipe -area of outer surface area
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