r191	incenter, perspective, altimedial triangles
r351	incenter, point X(63), perspective, complement, tripolar
r596	Euler line, incenter, Feuerbach hyperbola, point X(500)
r1208	incenter, altitude feet, perspective
r1945	incenter, Euler line
r2039	incenter, Feuerbach point, altitude feet, intouch triangle, concyclic points, radical center