r965
r966	isogonal points, desmic product
r968	circumcenter
r970	circumcenter, concyclic points
r982
r983	orthocenter, circumcenter, Parry reflection point
r984	perspective
r987	concyclic points
r988	orthocenter, antigonal points
r997
r998	circumcircle, isogonal points, circumcenter, centroid, point X(74), Parry point
r1109	isogonal points
r1110	isogonal points
c48
r1637