Circum- and Inconic Invariants of 3-Periodics in the Elliptic Billiard

04/06/2020
by   Dan Reznik, et al.
0

A Circumconic passes through a triangle's vertices; an Inconic is tangent to the sidelines. We study the variable geometry of certain conics derived from the 1d family of 3-periodics in the Elliptic Billiard. Some display intriguing invariances such as aspect ratio and pairwise ratio of focal lengths.

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