r8	pedal triangle, centroid, similar triangles
r9	circumcenter, symmedian lines
r10	similar triangles
r11	first Brocard triangle, centroid, perspective
r21	first Brocard triangle, isotomic points, tripole
d	first Brocard parabola
d	Johnson triangle
d	McCay circles
r679	first Brocard triangle, circummedial triangle
r680	circumcircle, Brocard circle, circumcenter, Apollonian circles, inverse points
r689	circumcenter, Apollonian circles, Brocard points, pedal triangle, Beltrami points, similar triangles