Question

an iron pipe 20cm long his exteroir diameter 15cm if the thickness of pipe is 1cm find the total surface area of pipe.

Answer 1

TSA of pipe = 2 * pie * R * h + 2 * pie * r * h
                     = 2 * 22/7 * 20 (R + r)
                     = 880/7 * (7.5 + 6.5)
                     = 880/7 * (14)
                     = 1760 cmsq. ANSWER.
thanks...