A metal pipe is long

MATHEMATICS · Single correct · CBSE · Mathematics · Surface Areas and Volumes · Surface Areas and Volumes

Problem

A metal pipe is

20\,\text{cm}

long. Its external radius is

4\,\text{cm}

and internal radius is

3\,\text{cm}

. Calculate the volume of metal used to make the pipe. (a)

112\pi\,\text{cm}^3

(b)

140\pi\,\text{cm}^3

(c)

160\pi\,\text{cm}^3

(d)

320\pi\,\text{cm}^3