Basic Parameters of the Second Napoleon Point
Construct the three interior equilateral triangles with centers , , on the sides of a given triangle . Then the lines , , intersect at the second Napoleon point .[more]
Let , , be the exact trilinear coordinates of with respect to ; ; , , be the side lengths of ; , , be the circumradius, inradius and semiperimeter of ; ; and express , , , in Conway notation, where is the Brocard angle.
You can drag the vertices , and .[less]
A triangle center is said to be even when its barycentric coordinates can be expressed as a function of three variables , , that all occur with even exponents. If the center of a triangle has constant barycentric coordinates, it is called a neutral center (the centroid is the only neutral center). A triangle center is said to be odd if it is neither even nor neutral.
Standard barycentric coordinates of a point with respect to a reference triangle have a sum of 1.
 C. Kimberling. "Encyclopedia of Triangle Centers." (Aug 31, 2022) faculty.evansville.edu/ck6/encyclopedia.