Equilateral triangle - semiperimeter
In geometry, an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. It is also a regular polygon, so it is also referred to as a regular triangle.
Semiperimeter is expressed as shownRelated formulas
|R||radius of the circumscribed circle (m)|
|r||radius of the inscribed circle (m)|