r1604	perspective, side triangle
r1621	retrocenter, Jerabek hyperbola
r1622	retrocenter, orthologic triangles, De Longchamps point
r1623	retrocenter, De Longchamps point, medial triangle, perspective
r1624	retrocenter, orthologic triangles, orthic triangle
r1632	perspective, cyclocevian points
r1668	centroid, tripolar, Steiner circumellipse, antimedial triangle
r1670	orthologic triangles
r1678	orthologic triangles, circumcircle, inverse points
r1780	orthocenter, orthic triangle, point X(275)
r1790	perspective
r1794	circumconic, perspective, side triangle
r1813	medial triangle
r1814	isogonal points, incentric triangle
r1815	autopolar triangle, circumconic
r1816	circumcevian triangle, perspective, cyclocevian points
r1879	circumconic, perspector
r1903	ninecenter, radical center
r1921	point X(55)
r2075	circumcenter, homothetic triangles
r2076	circumcenter, ninecenter
r2078	circumcenter, ninecenter, circumconic

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