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Cyclic quadrilateral

Revision as of 14:12, 18 June 2006 by IntrepidMath (talk | contribs)
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A Cyclic Quadrilateral is a quadrilateral that can be inscribed in a circle. In a cyclic quadrilateral, opposite angles sum to 180 degrees. They frequently show up on Olympiad tests, and have many special properties such as Ptolemy's theorem.

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