Saturday, November 28, 2020

1551.

 

1 comment:

  1. Generalization. Let P be a point. A1B1C1 circumcevian triangle of P. A2B2C2 circlecevian triangle of P. Xa,Xb,Xc same centers of BCA2, CAB2, ABC2. A1B1C1 and A2B2C2 are perspective. Perspector lies on circumcircle of ABC.

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1989. A Circle Centered at X(5476)