# Relo Triangle Calculator

The Reulot triangle is the area of intersection of three equal circles with centers at the vertices of a regular triangle and radii equal to its side. The non-smooth closed curve bounding this figure is also called the Reulot triangle. This is the simplest form of a constant width curve. Its two-dimensional equivalent is the Reulot tetrahedron. Enter one known value, then click the “Calculate” button.

**Relo Triangle Calculator**

**Radius, side length (a)**

**Arc length (l)**

**Perimeter (P)**

**Square (S)**

## Formulas

l = a π / 3

p = a π

S = ( π – √3 ) a2 / 2