A metal pipe is 77cm77 cm long. The inner diameter of a cross-section is 4cm4 cm, the outer diameter being 4.4cm,4.4 cm then find its outer curved surface area.
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Solution
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Dimensions be :
⇒R= outer radius =4.42=2.2cm
r= Inner radius =42=2cm
⇒ Height h=77cm
∴ Outer curved surface area =2πRh
=2×227×2.2×77
=1064.8cm2
∴ Outer curved surface area =1064.8cm2.
Hence, the answer is 1064.8cm2.
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