On the perimeters of simple polygons contained in a plane convex body

Details On the perimeters of simple polygons contained in a plane convex body On the perimeters of simple polygons contained in a plane convex body

2010-03-15

arxiv.org/abs/1003.2944v1

Mathematics

Metric Geometry

7 pages, 5 figures

Scientific paper

A simple n-gon is a polygon with n edges such that each vertex belongs to exactly two edges and every other point belongs to at most one edge. Brass, Moser and Pach asked the following question: For n > 3 odd, what is the maximum perimeter of a simple n-gon contained in a Euclidean unit disk? In 2009, Audet, Hansen and Messine answered this question, and showed that the supremum is the perimeter of an isosceles triangle inscribed in the disk, with an edge of multiplicity n-2. L\'angi generalized their result for polygons contained in a hyperbolic disk. In this note we find the supremum of the perimeters of simple n-gons contained in an arbitrary plane convex body in the Euclidean or in the hyperbolic plane.

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