Angle at centre is twice the angle at the circumference

Angle at centre is twice the angle at the circumference.
Adjust the point A to get the angle at the centre O = 60 and observe the angle at the circumference. [br]What is the angle at the circumference?
What is the relationship between the angle at the circumference and angle at the centre O?
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Information: Angle at centre is twice the angle at the circumference