Circle Theorem 2
Theorem 2:
Angles from the same arc in the same segment are equal.
In plain terms:
All angles from the [minor] arc between Points A and B will be the same when they converge on any point on the circumference of the circle.
The Angle AOB as indicated by the dotted lines (technically known as Radii) will be twice that of the angle at any point on the circumference from A and B.