ABSTRACT
Angular distance or displacement (scalar or vector quantity) is usually expressed in the units of degrees (where a complete circle is 360 degrees). Similarly, angular velocity and angular acceleration are often expressed as degrees per second (°/s) and degrees per second squared (°/s2 or degrees/second2) respectively. However, it is more convenient within human motion to use the term radian. The value for 1 radian represents an angle of approximately 57.3°. Fig. A3.2 defines the term radian and its relationship with angular degrees of movement.
