Question

A metal pipe is77cmlong ,the inner diameter of the cross_section is4cm and the outer diameter is 4.8 cm .find the(1) inner curved surface area (2)outer curved surface (3) total surface area

Answer 1

Inner surface area A1=2 πrh = 2×22/7× 2×77= 968 sqcm

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Outer surface area A2=2πRh = 2×22/7 ×2.4 ×77= 1161.6 sqcm

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Total surface area of pipe = A1 +A2 +2×area of base {π (R^2-r^2)}

TSA======== 968 +1161.6 + 2× 22/7 ×( 5.76 -4)

============968 +1161.6 +11.06

============2140.66 sq cm

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