IMO Shortlist 1969 problem 53


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Dodao/la: arhiva
2. travnja 2012.
1969 shortlist
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(POL 2) Given two segments AB and CD not in the same plane, find the locus of points M such that MA^2 +MB^2 = MC^2 +MD^2.
Izvor: Međunarodna matematička olimpijada, shortlist 1969