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It should be noted that the angle at the center of the circle is twice the angle at the circumference.
<h2>Circle Theorem</h2>It should also be noted that the angle in a semicircle is a right angle. Angles that are in the same segment are equal.
Furthermore, the opposite angle that is in a cyclic quadrilateral sum is 180°. The angle between the chord and the tangent is also equal to the angle in the alternate segment.
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