r604	incenter, Fuhrmann circle, inverse points
r605	orthologic triangles, Fuhrmann triangle
r606	excenters
r767	isogonal points, incenter, circumcircle, inverse points
r768	Euler line, Evans perspector
r769	Evans perspector, incenter, cevian quotient
r1039	Feuerbach point, pedal triangle, excenters, isogonal points
r1118	circumcenter, cevian triangle, Gergonne point, perspective, incenter