2021
DOI: 10.1007/s10883-021-09580-z
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Invariant Center Power and Elliptic Loci of Poncelet Triangles

Abstract: We study center power with respect to circles derived from Poncelet 3-periodics (triangles) in a generic pair of ellipses as well as loci of their triangle centers. We show that (i) for any concentric pair, the power of the center with respect to either circumcircle or Euler's circle is invariant, and (ii) if a triangle center of a 3-periodic in a generic nested pair is a fixed linear combination of barycenter and circumcenter, its locus over the family is an ellipse.

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Cited by 6 publications
(2 citation statements)
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“…Proofs that loci of certain triangle centers in over the confocal family are ellipses appear in [9,10,13,32]. A theory of locus ellipticity is slowly emerging, see [16,17]. In [11,12,28], similar geometric properties and invariants are used to cluster Poncelet triangles families.…”
Section: Related Workmentioning
confidence: 99%
“…Proofs that loci of certain triangle centers in over the confocal family are ellipses appear in [9,10,13,32]. A theory of locus ellipticity is slowly emerging, see [16,17]. In [11,12,28], similar geometric properties and invariants are used to cluster Poncelet triangles families.…”
Section: Related Workmentioning
confidence: 99%
“…An enduring conjecture has been that the locus of the incenter X 1 of a Poncelet triangle family can only be a conic if the pair is confocal [15].…”
Section: Straight and Nearly-straight Locimentioning
confidence: 99%