If you mean the side of a polygon, then that's just a length. Any convenient
unit of length may be used to describe it ... preferably one that produces a
convenient number.
0unces =)
grams
The appropriate unit for weight is a Newton.
centimeters
The best unit of measure to use when measuring the amount of water in a drinking glass is ounces. A liquid measuring cup can be used to measure the ounces of water.
Meter
The best SI unit to measure the mass of an elephant is the kilogram (kg).
You best bet would probably be to use kilograms.
liters
There are no units for measuring the use of temperature.
millimetres (or tenths of millimetres, if you have a micrometer)
Centimeters would be best for measuring a skunk.