For this exercise you need to remember the following:
1. There are 360 degrees in a circle.
2. The Diameter of a circle is defined as a straight line whose endpoints lie on the circle.
3. The Diameter of a circle passes through the center of the circle.
4. The Diameter divides the circle into two equal parts.
5. A Central angle is an angle whose vertex is located at the center of the circle.
Based on the explained above, you can set up the following: