# Product of the inradius and circumradius of a triangle

## Description

A circumscribed circle or circumcircle of a triangle is a circle which passes through all the vertices of the triangle. The center of this circle is called the circumcenter and its radius is called the circumradius. An incircle or inscribed circle of a triangle is the largest circle contained in the triangle; it touches (is tangent to) the three sides.The center of the incircle is called the triangle’s incenter and its radius is called inradius.The product of the incircle radius “r” and the circumcircle radius “R” of a triangle is related to the sides of the triangle

Related formulas## Variables

r | Inradius (m) |

R | Circumradius (m) |

a | Side of the triangle (m) |

b | Side of the triangle (m) |

c | Side of the triangle (m) |