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X(2), X(76), X(98), X(264), X(287), X(290), X(511), X(3978), X(16089), X(36897)), X(57541), X(70630), X(70631), X(70632)

infinite points of the Steiner ellipse

points on (O) and on the trilinear polar (L) of X(308) which also contains X(3978)

Geometric properties :

K1408 is the isogonal transform of K1404 and the isotomic transform of K357. It is a member of CL007.

K1408 is stable under X(2)-Hirst conjugation and X(290)-Ceva conjugation which actually coincide on K1408.

The tangents at A, B, C, X(290) pass through G.

The real asymptote is perpendicular at the anticomplement X(39355) of X(290) to the trilinear polar of X(308).