Article Content

In geometry, a cyclic quadrilateral is a quadrilateral whose vertices[?] are all lie on a single circle. The vertices are said to be concyclic[?].

• Opposite angles of a cyclic quadrilateral add up to $\pi$.
• The area of a cyclic quadrilateral is given by Brahmagupta's formula.
• The area of a cyclic quadrilateral is maximal among all quadrilaterals having the same (multi)set of side lengths.

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia
 Search over one million articles, find something about almost anything!

Featured Article
 Fibre optic gyroscope ... ...