r49	orthic axis, circumcircle
r51	Clawson point, point X(33), point X(55)
r129	orthic axis, circumcircle, circumcenter, inverse points
d	point X(468)
r480	isogonal points, symmedian point, orthic triangle
r728	Exeter point, complement, point X(468), ninecircle, orthocentroidal circle, inverse points
r907	intouch triangle, orthic triangle, perspective
r936	pedal triangle, circumcircle
r1092	Parry point, point X(110), point X(858), concyclic points
r1101	orthoassociate points, point X(858)
r1239	orthocenter, pedal triangle, orthic triangle, homothetic triangles
r1582	orthic triangle
r1631	altitude feet, circumcircle, tangent circles
r1845	circumcircle, tangent circles
r1886	circumcevian triangle, tangential triangle, perspective, centroid
r1892	retrocenter, isogonal points
r1977	altitude feet, isogonal points, centroid
r2024	altitude feet, altitudes, ninecircle