Opposite Angles of a Quadrilateral in a Circle
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The sum of the opposite angles of a "simple" quadrilateral in a circle is 180°.
[more]Contributed by: Jay Warendorff (April 2018)
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"Opposite Angles of a Quadrilateral in a Circle
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http://demonstrations.wolfram.com/OppositeAnglesOfAQuadrilateralInACircle/
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Published: April 24 2018