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X(2), X(7), X(8), X(78), X(84), X(273), X(322)

vertices of antimedial triangle

K154 is the locus of point P such that the cevian triangle of P and the extouch triangle are orthologic (extouch triangle = pedal triangle of X(40) = cevian triangle of X(8)). See also K034.

The isogonal transform of K154 is K179.