The barycentric coordinates of the circumcenter are defined by the tangents of the angles of the triangle.[br]De coordinate number are define as the [b]ratio of the substraction of the sum of the tangents by the tangents of an angle and twice the tangens of the sum of the tangents[/b].[br]For the 1st coordinate number we take [math]\hat{A}[/math], for the second [math]\hat{B}[/math] and for the third [math]\hat{C}[/math].