The Simson line is the line that contains the projections of the 3 feet from the heights of a triangle to the point P on the circumference. The geometric locus described in this notebook is that of the intersection point between the Simson line and a line perpendicular to that line and what passes through the point X20. The geometric locus is tritangent to the base triangle and also to the deltoid that forms the trace of the Simson line.
