Polygons in hyperbolic geometry 2: Maximality of area

Details Polygons in hyperbolic geometry 2: Maximality of area Polygons in hyperbolic geometry 2: Maximality of area

2010-08-23

arxiv.org/abs/1008.3821v1

Mathematics

Metric Geometry

20 pages, 1 figure

Scientific paper

This second part on polygons in the hyperbolic plane is based on the first part which deals with uniqueness and existence of cocyclic polygons with prescribed sidelengths. The topic here is the maximum question for the area of these polygons. It is shown that the maximal copies must be cocyclic and oriented-convex or have a special collinear shape. The maximal copies are unique up to rigid hyperbolic motions. The cocyclicity means that the vertices are situated on a distance circle, a distance line or a horocycle, the three types of cycles in the hyperbolic plane. The phenomenon of different circle types stands in salient contrast to the Euclidean case and pays for various difficulties in the hyperbolic discussion.

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