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X(2), X(55), X(57), X(196), X(222), X(258), X(364)

centroid of Q1Q2Q3

K577 is a cubic psK related to Poncelet poristic triangles. It is a nodal cubic with node X(57).

See Pseudo-Pivotal Cubics and Poristic Triangles.

K577 is the isogonal transform of K220 and the X(56)-isoconjugate of K360.