The Sum of Opposite Angles of a Quadrilateral in a Circle is 180 Degrees

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The sum of the opposite angles of a quadrilateral in a circle is 180°, as long as the quadrilateral does not cross itself.

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Drag the vertices on the circle to change the angles.

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Contributed by: Jay Warendorff (January 2008)
Open content licensed under CC BY-NC-SA


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