Hello,

A hockey puck has the shape of a cylinder, so its volume can be
calculated using the formula for the volume of a cylinder.

Similarly, a copper pipe is also a cylinder.
In our calculation of volume, we must ensure that our units correspond
to each other. So, if I choose to use centimetres, then all lengths
should be in centimetres, etc...
We are given that the diameter of the pipe is 1cm, but the length is 4
metres.
Convert centimetres into metres (or vice versa) first, then use the
volume formula.

You can also use our handy calculator:
http://mathcentral.uregina.ca/volume_calculator

Tyler