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Angles Inscribed in a Semicircle - Law of Thales

Angle APB intercepts a semicircle. Drag points A to change the orientation of the semicircle. Drag point P to change the angle.

1.

Angle APB intercepts a semicircle. Drag points A to change the orientation of the semicircle. Drag point P to change the angle. Does the measure of the angle APB ever change? What might be generalized about an angle that intercepts a semicircle?