r256	circumtangential triangle, Simson line, radical axis
r257	circumtangential triangle, antimedial triangle, Morley triangle, homothetic triangles
r911	circumtangential triangle, circumcircle, homothetic triangles
r912	ninecenter, radical center
r913	circumcircle, Stammler hyperbola, circumcenter
r1388	Steiner deltoid, ninecircle, homothetic triangles