r81	Euler line, isogonal points
r82	orthocenter, symmedian point, Kosnita point, point X(65), point X(265)
r83	circumcircle, point X(74)
r107	Stammler hyperbola
r451	perspective, circumcenter
r522	Feuerbach hyperbola, excentral triangle, point X(100)
r708	Euler line, ninecircle
r774	orthocenter, circumcenter, ninecenter, altitudes, Kosnita point, point X(185), point X(389)
r832	orthic triangle, perspective, homothetic triangles, similar triangles
r842	centroid, orthocenter, pedal triangle
r855	circumcenter, orthocenter, isogonal points, circumconic
r888	circumcenter, symmedian point, De Longchamps point
r915	orthocenter, symmedian point, De Longchamps point, altitudes
r956	second Brocard parabola, symmedian point
r964	cevian triangle, ninecircle
r1017	Euler line, orthic triangle, orthologic triangles, pedal triangle
r1038	Feuerbach point, pedal triangle, incenter, excenters, circumcenter
r1045	circumcevian triangle, perspective
r1083	medial triangle
r1093	isotomic points, orthocenter, retrocenter, third Brocard point
r1140	Steiner circumellipse, isogonal points, point X(237)
r1154	perspector, point X(647)
r1168	centroid, circumcenter, symmedian point, Weill point
r1172	inconic, perspector, circumcenter, retrocenter, point X(125)
r1223	orthocenter, point X(74)

1

2