If you mean the distance around the circumference then you multiply the length of the diameter by Pi. (Pi is a constant roughly equal to 3.14)
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pi is the ratio of a circle's diameter (the distance across it) to its circumference (the distance around it).
The radius is the distance from the center to the outer edge of the circle. You can measure the diameter, the distance from side to side, and divide by 2.
Well, what you do is you would find the circumference, or the distance around the circle.
The distance around a circle is its circumference
The distance around a circle is called the circumference of it. To find the circumference, multiply its radius by 2, then multiply by pi.