An angle whose vertex is at the center of the circle
- An angle whose vertex is at the center of the circle and whose sides are radii
- An angle whose vertex is at the center of the circle and with two radii as its sides
- An angle whose vertex is at the center of the circle is called
- An angle whose vertex is at the center of the circle and the measure is equal to its intercepted arc
- An angle whose vertex is at the center of the circle and whose sides contain the radii of the circle
- An angle whose vertex is at the center of the circle is a middle angle of that circle
- An angle whose vertex corner is at the center of the circle
- Center and radius of a circle