## Encyclopedia > Brahmagupta's formula

Article Content

# Brahmagupta's formula

In geometry, Brahmagupta's formula gives the area of a cyclic quadrilateral whose sides have lengths a, b, c, d as:

$\sqrt{(s-a)(s-b)(s-c)(s-d)}$

where s=(a+b+c+d)/2.

Heron's formula for the area of a triangle is the special case obtained by taking d=0.

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
 List of rare diseases starting with A ... Achromatopsia incomplete, X-linked[?] Achromatopsia Acid maltase deficiency[?] Acidemia, isovaleric[?] Acidemia, propionic[?] Acitretine antenatal ...