r6	Steiner point, first Brocard triangle
r185	orthologic triangles, similar triangles
r243	Fermat points, Kiepert hyperbola, Steiner dual line, orthic axis, concyclic points
r1471	circumcircle, orthologic triangles
r1801	centroid, incenter, excenters, circumcenter, extangential triangle
r1803	Jerabek hyperbola, orthic triangle
r1818	intouch triangle, incircle
r1819	orthocenter, circumcenter, altitude feet
r1820	altitudes, Euler line
r1822	circumcenter, Euler line, orthic triangle
r1823
r1912	orthologic triangles, ninecircle