Given a general Quadrilateral with sides of lengths , , , and
(Beyer 1987), the Area is given by

where and are the diagonal lengths.

**References**

Beyer, W. H. (Ed.). *CRC Standard Mathematical Tables, 28th ed.* Boca Raton, FL: CRC Press,
p. 123, 1987.

© 1996-9

1999-05-26