The same as linear distances: kilometres, metres, centimetres, millimetres, etc.
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If you measure the middle of the circle and then times it by 3
The circumference of a circle measures the distance around the circle.
The circumference is the distance around a circle and it is measured by:- Circumference of a circle = 2*pi*radius or pi*diameter
The distance around a circle is called the circumference of it. To find the circumference, multiply its radius by 2, then multiply by pi.
That point is known as the "center of the circle". Every circle has one.