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.[more]
Drag the vertices on the circle to change the angles.[less]
Contributed by: Jay Warendorff (January 2008)
Open content licensed under CC BY-NC-SA