Question

A metal pipe is $77$cm long. The inner diameter of a cross section is $4$ cm, the outer diameter being $4.4$ cm. Find its outer curved surface area.

Answer 1

There is a inner Cylinder and Outer Cylinder.

Outer Radius = 2.2 cm = R

Height of the pipe = 77 cm = h

Outer Curved Surface area of the pipe = 2 x ∏ x R x h

= 2 x 3.142 x 2.2 x 77

= 1064.5 cm2