Area-Invariant Pedal-Like Curves Derived from the Ellipse
September 05, 2020 Β· Declared Dead Β· π BeitrΓ€ge zur Algebra und Geometrie / Contributions to Algebra and Geometry
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Authors
Dan Reznik, Ronaldo Garcia, Hellmuth Stachel
arXiv ID
2009.02581
Category
math.MG
Cross-listed
cs.GR,
cs.RO,
math.DG
Citations
4
Venue
BeitrΓ€ge zur Algebra und Geometrie / Contributions to Algebra and Geometry
Last Checked
1 month ago
Abstract
We study six pedal-like curves associated with the ellipse which are area-invariant for pedal points lying on one of two shapes: (i) a circle concentric with the ellipse, or (ii) the ellipse boundary itself. Case (i) is a corollary to properties of the Curvature Centroid (KrΓΌmmungs-Schwerpunkt) of a curve, proved by Steiner in 1825. For case (ii) we prove area invariance algebraically. Explicit expressions for all invariant areas are also provided.
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