r593	orthocenter, Brocard line
r726	Brocard line, circumcenter, point X(389)
r852	orthiac triangles, altitudes
r1863	ninecenter, altitude feet
r1865	ninecenter, perspective, antimedial triangle, orthic triangle, Carnot triangle, point X(110)
r1937	ninecenter, orthocenter, cevian quotient
r1938	circumcenter, medial triangle, orthic triangle, point X(115)
r1998	circumcenter, orthologic triangles, ninecircle, Kosnita point
r2023	circumcenter, incenter, ninecenter, altitude feet, altitudes, ninecircle