The angular velocity is the time derivative of the angular distance with direction perpendicular to the plane of angular motion,
Angular Velocity
See also
Angular Acceleration, Angular Distance, Speed, Uniform Circular Motion, VelocityExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Angular Velocity." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/AngularVelocity.html