Geodesic
Simple geometric facts that help to solve geometric problems
Matematičeskoe obrazovanie, Tome 94 (2020) no. 2, pp. 2-17.

Voir la notice de l'article provenant de la source Math-Net.Ru

A number of examples is provided where a solution of a rather complicated geometric problem is based on some simple and well-known geometric facts.
Keywords: solving geometric problems, key idea, basic geometric fact. 
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A. N. Afanasyev. Simple geometric facts that help to solve geometric problems. Matematičeskoe obrazovanie, Tome 94 (2020) no. 2, pp. 2-17. http://geodesic.mathdoc.fr/item/MO_2020_94_2_a0/