Tuesday, January 25, 2022

1771.

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1 comment:

  1. Dr. Abdilkadir AltıntaşJanuary 26, 2022 at 1:57 PM

    https://artofproblemsolving.com/community/u426945h2765612p24216126

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1987. Circumcenter On Euler Line

 Let H=X(4)-Orthocenter of ABC. A 1 B 1 C 1 cevian triangle of H. B1 A , C1 A are reflections of B1, C1 on A. L A , line through B1 A , C1...