The formula of angular frequency or angular speed is given by:

ω = 2∏ / T = 2∏f

Where we have:

ω: angular frequency

T: period

f: frequency

For movement alone a circle, we have:

ω = dθ / dt

Where θ is the angle change.

If we know the radius of the circle is R, then we can determine the velocity by:

v = Rω