Question

a metal pipe is 77 cm, the inner diameter of the cross-section is 4 cm and outer diameter is4. 5cm find inner curved surface area, outer curved surface area and total surface area?

Answer 1

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Answer 2

C.S.A. of inner one=2πrh
=2*22/7*2" 77
by solving this we get 968 sq.cm
C.S.A of outer one=2πrh
=2*22/7*9/4*77
by solving this we get 1089 sq.cm
total surface area =πr(r+h)
=22/7*9/4(9/4+77)
=99/4*317/4
=