r1726	ninecircle, pedal circle, isogonal points
r1730	ninecenter, isogonal points, medial triangle
r1743	Gergonne point, incenter, intouch triangle
r1766	centroid, symmedian point, Wallace hyperbola
r1770	perspector, circumcircle, circumcevian triangle, tripole
r1794	perspective, cevian triangle, side triangle
r1796	orthocenter, circumcenter, isogonal of the infinite point
r1797
r1815	cevian triangle, autopolar triangle
r1841	perspective, orthologic triangles
r1879	perspector, cevian triangle
r2035	antiorthic axis, symmedian point, Mittenpunkt, anticevian triangle, perspective, intangential triangle
r2040	incenter, incentric triangle, antipedal triangle, Spieker point, orthologic triangles
r2078	circumcenter, cevian triangle, ninecenter

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