Question

The outer diameter of a metallic pipe is 18cm and the tckness of the pipe is 2cm and the eght is 4cm find the surface area of the metallic pipe

Answer 1

i hope you asked about the inner curved surface area
diameter of the inner side = 18-4
                                         = 14cm
csa of cylinder = 2*22/7*7*4
                        = 176 cm^2
hope it is right