Saturday, November 28, 2020

1578.

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  1. Dr. Abdilkadir AltıntaşJanuary 18, 2021 at 1:39 AM

    ABC is perspective with A1B1C1 and A2B2C2. In both case perspector is X(4)-orthocenter of ABC.

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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...