r2080

Let Ha, Hb, Hc be the altitude feet. Let Hab, Hac be the orthogonal projections of  Ha on the B- and C- altitudes. Define cyclically Hbc, Hba, Hca, Hcb. Let La be the radical axis between {AHbaHca}  {AHabHac} and define cyclically Lb, Lc. The lines La, Lb, Lc are concurrent.


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