You need to be more specific.
All I can tell you for now is that there are 2pi radians in a circle.
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The most commonly used measure of a circle is its radius, which is the distance from the center of the circle to any point on its circumference. The radius is generally represented by the letter "r". Other measures of a circle include its diameter (the distance across the circle passing through its center) and its circumference (the distance around the circle).