Corollary 3 of the Inscribed Angle Theorem states that an angle inscribed in a semicircle is a right angle.
Formula: If a line segment connecting the endpoints of an arc of a circle forms a semicircle, then any angle inscribed in that arc is a right angle.
Short definition: An angle formed by two points on a circle, where the two points are endpoints of a diameter of the circle, is a right angle.
Corollary 3 of Inscribed angle theorem
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