IMO Shortlist 1987 problem 13


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2. travnja 2012.
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Is it possible to put 1987 points in the Euclidean plane such that the distance between each pair of points is irrational and each three points determine a non-degenerate triangle with rational area? (IMO Problem 5)

Proposed by Germany, DR
Izvor: Međunarodna matematička olimpijada, shortlist 1987