1) Central Angle: A central angle is an angle whose vertex is at the center of the circle. The measure of a central angle is equal to the measure of the arc it intercepts.
2) Inscribed Angle: An inscribed angle is an angle whose vertex is on the circle and whose sides intersect the circle at two different points. The measure of an inscribed angle is half the measure of the arc it intercepts.
3) Angle at the circumference: An angle at the circumference is an angle whose vertex is on the circle and whose sides intersect the circle at two different points. The measure of an angle at the circumference is equal to half the difference between the measures of the intercepted arcs.
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