Family Ties: Relating Poncelet 3-Periodics by their Properties
arXiv:2012.11270
Abstract
We compare loci types and invariants across Poncelet families interscribed in three distinct concentric Ellipse pairs: (i) ellipse-incircle, (ii) circumcircle-inellipse, and (iii) homothetic. Their metric properties are mostly identical to those of 3 well-studied families: elliptic billiard (confocal pair), Chapple's poristic triangles, and the Brocard porism. We therefore organized them in three related groups.
20 pages, 10 figures, 4 tables, 18 video links