The circumference of any circle is found with 2pr 2 p r where r radius r r a d i u s. The length of an arc that is a fraction f of a circle is f C f t r. Remember the circumference of a circle pi d and the diameter 2 times text radius.
Arc length 2prth360 where th indicates the central angle of the arc in degrees.
Arc Length The arc length is. The arc length is frac 1. L th r when th is in radians L th p 180 r when th is in degrees. The general formulas for calculating the arc length of a section of a circle are.