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.
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Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Inscribed Angles in a Circle Subtended by the Same Chord"
http://demonstrations.wolfram.com/InscribedAnglesInACircleSubtendedByTheSameChord/
Wolfram Demonstrations Project
Published: March 7 2011