# Brahmagupta's formula (area of a cyclic quadrilateral )

## Description

In Euclidean geometry, a cyclic quadrilateral or inscribed quadrilateral is a quadrilateral whose vertices all lie on a single circle. This circle is called the circumcircle or circumscribed circle, and the vertices are said to be concyclic.

The area A of a cyclic quadrilateral with sides a, b, c, d is given by Brahmagupta’s formula.

## Variables

A | Area of the cyclic quadrilateral (m^{2}) |

s | Semiperimeter of the cyclic quadrilateral (a+b+c+d)/2 (m) |

a | Length of the side of the cyclic quadrilateral (m) |

b | Length of the side of the cyclic quadrilateral (m) |

c | Length of the side of the cyclic quadrilateral (m) |

d | Length of the side of the cyclic quadrilateral (m) |