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:*Inner curved surface area*Outer curved surface area* Total surface area

Answer 1

The length is given 77 cm and inner diameter is 4 cm and outer diameter is 4.4 cm.

To determine the inner curved surface area

Use the inner diameter that is 4cm.

And use the formula

`ISA=2\pi rh`

To determine the outer curved surface area , use the outer diameter .

`sa=2\pi Rh=2\pi*2.2*77=3726.8sq.cm`