Sometimes things go in circles. There are two ways you can look at something moving in a circle. First, you could use the distance it travels and the linear velocity. This is essentially what we have been doing.
Another way to describe this circular moving object is to look at the angular position of the thing along with how fast this angular position changes. This is called the angular velocity (represented by the Greek letter ω)
Maybe this diagram will help.
Here θ is the angular position of the object. If the angle is measured in radians, then the following relationships are true.