Inscribed Angles in a Circle Subtended by the Same Chord

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All angles inscribed in a circle and subtended by the same chord are equal. The inscribed angle is equal to one half of the central angle subtended by the chord.


If the chord is a diameter of the circle then the angle is 90 degrees, as in Thales' theorem.


Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA




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