IMO Shortlist 1968 problem 13


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2. travnja 2012.
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Given two congruent triangles A_1A_2A_3 and B_1B_2B_3 (A_iA_k = B_iB_k), prove that there exists a plane such that the orthogonal projections of these triangles onto it are congruent and equally oriented.
Izvor: Međunarodna matematička olimpijada, shortlist 1968