Really you could use any unit you wish. Toothpicks or matchsticks laid end to end would give you a measure in those units. However, since no one will understand the measurement if you pick one of those choices, it's probably best to use a ruler or measuring tape. The unit will be marked on the tool you choose to use, either inches or centimeters.
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There are many units which are used to measure the lengths of the object . The smallest unit of length is fero meter.
A circle can have a unit of length which could be either a measure of its diameter or radius, or of its circumference. Or the circle could have the unit of area.
Honestly you could use any unit of measure! I would use inches. Thanks Cheezpuffz
The basic metric unit of measure for length is the meter (m).
A metre.