# Cyclic quadrilateral circumradius ( Parameshvara's formula )

## 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 circumradius of a Cyclic quadrilateral is related to its successive sides and the semiperimeter of the Cyclic quadrilateral.

Related formulas## Variables

R | Cyclic quadrilateral circumradius (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) |

s | Semiperimeter of the cyclic quadrilateral (m) |