Something to help us measure.
Example
Handspan, pace, counters, tiles, cubes, squares and bottle tops are arbitrary units.
The area of this rectangle has been measured in bottle tops. The area is twenty-eight bottle tops.
Something to help us measure.
Example
Handspan, pace, counters, tiles, cubes, squares and bottle tops are arbitrary units.
The area of this rectangle has been measured in bottle tops. The area is twenty-eight bottle tops.
