r1020

Let P, Q be two points, A'B'C' the circumcevian triangle of Q. The circles {AA'P}, {BB'P}, {CC'P} intersect at P and at a point X collinear with P and Q. When P is the circumcenter and Q the orthocenter, X is X(186). When P is the orthocenter and Q the centroid, X is X(858).


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