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7. A metal pipe is 77 m long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm. Find its- 1. Inner curved surface area 2. Outer curved surface area. 3. Total surface area.

Answer» 7. A metal pipe is 77 m long. The inner diameter of a cross section is 4 cm, the outer diameter being 4.4 cm. Find its- 1. Inner curved surface area 2. Outer curved surface area. 3. Total surface area.


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