If the central angle has a measure of 1 radian it will subtend an arc that has the same length as its radius regardless of the size of the circle 0 Or 0 A 2 B s 0r When finding arc length use s 8r O D CE R 0 A R Finding Arc Length with a Central Angle Measured in Radians In circle O 0 2 6 radians What is the length of minor arc DE S S B S 31 2 cm