Question

a metallic pipe is 0.7 cm thick. inner radius of the pipe is 3.5 cm and length is 5dm. find its total surface area.

Answer 1

We know,

Total surface area of pipe = 2π (r+ R ) ( h+ R - r)

or, Total surface area of pipe= 2×22/7(3.5+4.2)(50+4.2-3.5)

= 44/7 × 7.7 × 50.7

=2453.88cm^2

So the answer should be 2453.88cm^2