We call the radians per second displayed by a body with UCM angular velocity, w. As well as describing an angle, the speed at which the arc is covered can be measured in m/s, this is linear velocity. The difference between these two ways of measuring velocity depends on the radius.
To calculate angular velocity you just divide the angle covered ( f in radians) by the time taken (t):

Given that  f=s/r, when you substitute in the previous equation, you are left with

s/r=v

or      also