Cyclic polygons with given edge lengths: Existence and uniqueness |
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Authors: | Iosif Pinelis |
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Institution: | (1) Department of Mathematical Sciences, Michigan Technological University, Houghton, MI 49931, USA |
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Abstract: | Let a1, ..., an be positive numbers satisfying the condition that each of the ai’s is less than the sum of the rest of them; this condition is necessary for the ai’s to be the edge lengths of a (closed) polygon. It is proved that then there exists a unique (up to an isometry) convex cyclic
polygon with edge lengths a1, ..., an. On the other hand, it is shown that, without the convexity condition, there is no uniqueness—even if the signs of all central
angles and the winding number are fixed, in addition to the edge lengths. |
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Keywords: | 51M04 51M25 52A25 52A10 |
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