r1705

Let H be the orthocenter; N the ninecenter; HaHbHc the orthic triangle. Let Ma, Mb. Mc the midpoints of the sides. Let Qa, Qb, Qc be the circumcenters of NMbMc, NMcMa, NMaMb. The triangles QaQbQc, HaHbHc are homothetic.


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