Some characterizations of the circle related to circumscribed equiangular polygons

The main purpose of this note is to prove the following: let n ≥ 3 be a fixed integer number and let K be a convex body such that for every equiangular circumscribed n -gon, the midpoints of its sides belong to K . Then K is a disc. We also prove that a 3-dimensional convex body K such that the cent...

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Veröffentlicht in:Boletín de la Sociedad Matemática Mexicana 2021-11, Vol.27 (3), Article 67
Hauptverfasser: Jerónimo-Castro, Jesús, Jimenez-Lopez, Francisco G., Velasco-García, Ulises
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container_title Boletín de la Sociedad Matemática Mexicana
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Jimenez-Lopez, Francisco G.
Velasco-García, Ulises
description The main purpose of this note is to prove the following: let n ≥ 3 be a fixed integer number and let K be a convex body such that for every equiangular circumscribed n -gon, the midpoints of its sides belong to K . Then K is a disc. We also prove that a 3-dimensional convex body K such that the centers of the faces of all its circumscribed regular tetrahedra belong to K is a ball.
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Original Article
Tetrahedra
title Some characterizations of the circle related to circumscribed equiangular polygons
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