Denote
Ma, Mb, Mc = the midpoints of AA'. BB', CC', resp.
Ha, Hb, Hc = the orthocenters of OMbMc, OMcMa, OMaMb, resp,
The triangles ABC and HaHbHc share the same centroid G
Francisco Javier García Capitán A triangle of orthocenters with centroid G
FJGC
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