So in summation The formula for arc length is. It is any portion of the circumference of a circle of any length. A r 2 th2 when th is measured in radians and.
There is a shorthand way of writing the length of an arc.
A th360pr 2 when th is measured in degrees. The corresponding formulas for arc sector are. It is any portion of the circumference of a circle of any length. Central angle in degrees.