r1716

Let HaHbHc be the orthic triangle, A the reflection of Ha in HbHc and B, C its analogous. Let Oa, Ob, Oc be the circumcenters of ABC, BCA, CAB. The lines AOa, BOb, COc concur at the isogonal of the cevian quotient between the ninecenter N and the circumcenter O.


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