r870	orthic triangle, orthocenter, perspective
r890	tripolar, isogonal points, circumcircle, incircle, point X(55), Mittenpunkt
r932	intangential triangle, extouch triangle, perspective, Nagel point, Mittenpunkt
r980
r1053	cevian triangle, centroid, anticomplement, anticevian triangle
d	point X(237)
r1149	point X(523), incenter, Feuerbach point
r1150	point X(523), Steiner point, centroid
r1151	point X(523), orthocenter, point X(125)
r1152	point X(523), ninecenter, point X(110)
r1183	altitude feet, circumcenter, ninecenter, centroid
r1293
r1304	tripole, cevian product
r1405	Neuberg triangle, antimedial triangle, orthologic triangles, centroid, circumcenter, symmedian point
r1414	altitudes, orthocenter
r1458	orthocenter, circumcenter, point X(155)
r1466	cevian triangle, centroid, symmedian point
r1475	circumconic
r1514	circumconic
r1550	incenter, excenters
r1573	isogonal points, complement, radical center
r1716	circumcenter, ninecenter, orthic triangle, isogonal points
r1824	isogonal points
r1825	isogonal points, isotomic points
r1937	ninecenter, orthocenter, point X(52)

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