Question

a metal pipe iis 77cm long the inner diameter of a cross section is 4cm the outer diameter being 4.4cm find its i)inner curved surface ii)outer curved surface area iii)total surface area

Answer 1

don't know if I could know the process so may be interested can solve

Answer 2

inner curved surface area=2pirh=2×22/7×2×77cmsq.
outer curved surface area=2piRh=2×22/7×2.2×77cmsq.
total surface area=pi h( R sq.-r sq.)=22/7×77(2 sq.-2.2sq.)cm sq.
hope it helps you.....