Saturday, June 12, 2021

1720. Collinear Circumcenters

5 comments:

  1. If the cubic is another pivotal isogonal circular cubic K021, the fixed point is X(98).

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  2. Fixed point is singular focus of circular cubics?

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  3. https://faculty.evansville.edu/ck6/encyclopedia/SingularFocusOfCubics.html

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  4. Maybe! But I can not define the focus of a curve on a involutory plane!

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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...