Geodesic
On some properties and criterions of a parallelogram
Matematičeskoe obrazovanie, Tome 93 (2020) no. 1, pp. 36-45.

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

Some properties of a parallelogram are considered and some conditions are established under which the properties become criterions. To be continued.
Keywords: properties of a parallelogram, signs of a parallelogram. 
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Al. A. Privalov. On some properties and criterions of a parallelogram. Matematičeskoe obrazovanie, Tome 93 (2020) no. 1, pp. 36-45. http://geodesic.mathdoc.fr/item/MO_2020_93_1_a4/

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