Saturday, September 14, 2024

1987. Circumcenter On Euler Line

 Let H=X(4)-Orthocenter of ABC. A1B1C1 cevian triangle of H. B1A, C1A are reflections of B1, C1 on A.

LA, line through B1A, C1A. define LB, LC cyclically.

A2B2C2 triangle bounded by lines LA, LB, LC.


* Circumcenter of  A2B2C2 lies on Euler line of ABC.

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1988. Circumcenters On Euler Line

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