It's called the "circumference" of the circle.
It's equal to (pi) times (the circle's diameter).
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Circumference can be measured in any linear measurement. It could be centimeters, meters, miles, inches etc. generally the circumference is the linear distance around a circle. When you have a perfect circle, it's fairly easy to calculate if you know the distance across the circle.
The distance around a circle is its circumference.
The distance around a circle is its circumference
The circumference is the distance around a circle.
I believe that the distance around a circle is called the circumference.