Geodesic
On some properties and criterions of a parallelogram, finished
Matematičeskoe obrazovanie, no. 2 (2020), pp. 35-41 Cet article a éte moissonné depuis la source Math-Net.Ru

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Some properties of a parallelogram are considered and some conditions are established under which the properties become criterions. The end of the article.
Keywords: parallelogram, parallelogram properties, parallelogram signs. 
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     title = {On some properties and criterions of a parallelogram, finished},
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Al. A. Privalov. On some properties and criterions of a parallelogram, finished. Matematičeskoe obrazovanie, no. 2 (2020), pp. 35-41. http://geodesic.mathdoc.fr/item/MO_2020_2_a4/

[1] Balk M.B., Boltyanskii V.G., Geometriya mass, Nauka, M., 1987, 158 pp.

[2] Boltyanskii V.G., “Chetyrekhugolniki”, Kvant, 1974, no. 9, 53—56