Κυριακή 20 Οκτωβρίου 2019

HYACINTHOS 4547

Dear Paul, Antreas and other Hyacinthists,

May I suggest another conjecture - or is this already known?:

Let A'B'C' be the reflections of ABC through a point D, then the
circumcircles of AB'C', A'BC' and A'B'C concur in a point.

Kind regards,
Sincerely,
Floor van Lamoen
 

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