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The aim of this paper is to study quasi-rational polygon related to outer billiard. We give a new characterisation of this class of polygons,and characterize the quasi-rational quadrilaterals.
Cyclic polygons in classical geometry
cyclic polygon Euclidean geometry hyperbolic geometry spherical geometry
2010/12/7
Formulas about the side lengths, diagonal lengths or radius of the circumcircle of a cyclic polygon in Euclidean geometry, hyperbolic geometry or spherical geometry can be unified.