Arc length r. This angle measure can be in radians or degrees and we can easily convert between each with the formula p radians 180 p r a d i a n s 180. Typically the interior angle of a circle is measured in degrees but sometimes angles are measured in radians rad.
One radian is the angle formed when an arc of a circle is equal in length to the radius of that circle.
Plugging our radius of 3 into the formula we get C 6p meters or approximately 188495559 m. For dispersion or variation of set of values try Standard Diviation Calculator. As circumference C 2pr L th 2pr 2p L th r. Where th indicates the central angle of the arc in radians.