How to Find the central angle w/ the corresponding arc degree

In this video the author shows us how to find the measure of a central angle when its corresponding arc degree is given. He shows how to solve this kind of problem by solving an example. He states the central angel made by the arc is nothing but the given arc degree and states that both are one and the same. The author in this video gives a quick example of what a central angle is and its relation to the arc degree.