Exterior bisector

The exterior angle bisectors of a triangle are the lines bisecting the angles formed by the sides of the triangles and their extensions.

exterior_bisector(Point, Point, Point)

Given three points A, B and C describing a triangle, computes the exterior bisector of the vertex B.

exterior_bisector(Triangle, Integer)

Given a triangle and an integer n, computes the exterior bisector of the n-th vertex of the triangle.