r1934

Let Ea, Eb, Ec lbe the excenters of ABC. Let Ka, Kb, Kc be the Kosnita points of EaBC, EbCA, EcAB. Let A', B', C' be the cevian traces of the incenter. The lines A'Ka, B'Kb, C'Kc concur at the isogonal of the Spieker point.


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