r214	orthic triangle
r647	orthopole, medial triangle, orthic triangle
r726	Brocard line, circumcenter, point X(52)
r774	orthocenter, circumcenter, ninecenter, altitudes, Jerabek hyperbola, Kosnita point, point X(185)
r839	orthocenter, orthic triangle, homothetic triangles
r1978	orthocenter, circumcenter, isogonal points, altitude feet