The circumference of a circle measures the distance around the circle.
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There is no such specific unit of measure as a circumference - a circumference is merely the distance around something.
Circumference is a linear measure and has no volume - just as a straight line has no volume.
The circumference is the distance around a circle and it is measured by:- Circumference of a circle = 2*pi*radius or pi*diameter
A tape measure.
The answer depends on what the 38 is a measure of!