Geodesic
Equilateral triangle helps to solve a problem
Matematičeskoe obrazovanie, no. 1 (2018), pp. 33-37 Cet article a éte moissonné depuis la source Math-Net.Ru

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Keywords: tasks for finding angles, auxiliary regular triangle. 
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M. A. Tleubergenova. Equilateral triangle helps to solve a problem. Matematičeskoe obrazovanie, no. 1 (2018), pp. 33-37. http://geodesic.mathdoc.fr/item/MO_2018_1_a3/

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[3] Sharygin I.F., Geometriya, Zadachnik 9–11 kl., Drofa, M., 1997