IMO Shortlist 1992 problem 8


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2. travnja 2012.
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Show that in the plane there exists a convex polygon of 1992 sides satisfying the following conditions:

(i) its side lengths are 1, 2, 3, \ldots, 1992 in some order;
(ii) the polygon is circumscribable about a circle.

Alternative formulation: Does there exist a 1992-gon with side lengths 1, 2, 3, \ldots, 1992 circumscribed about a circle? Answer the same question for a 1990-gon.
Izvor: Međunarodna matematička olimpijada, shortlist 1992