r50	tangential triangle, extangential triangle, homothetic triangles, point X(55)
d	point X(33)
r141	tangential triangle, perspective, point X(56), incenter
r932	extouch triangle, perspective, cevian quotient, Nagel point, Mittenpunkt
r933	intouch triangle, perspective, incenter
r934	Euler line, circumcenter, incenter
r2035	antiorthic axis, circumconic, symmedian point, Mittenpunkt, anticevian triangle, perspective