The Poncelet Simson-line envelope point conjecture

Let a Poncelet triangle family be inscribed in a circle. Fix a point FF on the circumcircle, let VV be the perpendicular projection of FF onto the Simson line of a member of the family, and let the Simson lines vary through the family. Simson-line envelope point conjecture. Over any Poncelet triangle family inscribed in a circle, the envelope of the Simson lines is a point WW antipodal to FF on the circular locus of VV. The preceding theorem establishes that the locus of the projection VV is a circle, and the claim identifies the Simson-line envelope; its general validity is presented as an open conjecture.

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Primary source

Dan Reznik and Ronaldo Garcia, “Poncelet Parabola Pirouettes”, arXiv:2110.06356 (2022).

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