Question

A 20 m long iron pipe has an exterior diameter of 25 cm. If the thickness of the pipe is 1 cm,
find the internal curved surface area of the pipe.
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Answer 1

Answer:

TSA of pipe = 2πh(R+r)+2π(R2−r2)

                     = 2×722×20(12.5+11.5)+2×722((12.5)2−(11.5)2)

                     = 744×480+744×24

                    = 721120+71056=722176

                     = 3167 cm2

Answer 2

Answer:

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