Csa of a pipe

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Inner csa = 2.pi.r.h
Outer csa=2.pi.R.h
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The cross-sectional area is the area of its circle, and you can calculate it from the circle's radius. Multiply the circle's radius by 2 to calculate its diameter.
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A pipe is in the shape of a hollow cylinder

             Inner  C.S.A = 2πrh
             Outer C.S.A = 2πRh

where, r is the radius of inner cylinder & R is the radius of outer cylinder
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