# Relation between the sides of an Equilateral triangle and its circumradius and inradius

## Description

An equilateral triangle is a triangle in which all three sides are equal. In traditional or Euclidean geometry, equilateral triangles are also equiangular; that is, all three internal angles are also congruent to each other and are each 60. The sides of the equilateral triangle are related to the radius of the circle circumscribing the three vertices (circumradius) and the radius of the inscribed circle.

Related formulas## Variables

a | The side of the triangle (m) |

b | The side of the triangle (m) |

c | The side of the triangle (m) |

R | The circumradius (m) |

r | The inradius (m) |