Geodesic
Remarkable triangles
Matematičeskoe obrazovanie, Tome 103 (2022) no. 3, pp. 2-14.

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

Four types of triangles are considered, in which the base is the average (arithmetic, geometric, harmonic, quadratic) of the sides. Some new properties of these triangles are described. The article is printed with a continuation. 
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     author = {S. I. Kublanovskii and S. G. Bershadskiy},
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S. I. Kublanovskii; S. G. Bershadskiy. Remarkable triangles. Matematičeskoe obrazovanie, Tome 103 (2022) no. 3, pp. 2-14. http://geodesic.mathdoc.fr/item/MO_2022_103_3_a0/

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[2] I. Kushnir, “Klassicheskie srednie v treugolnike”, Kvant, 2013, no. 2, 32–33

[3] A. Blinkov, Klassicheskie srednie v arifmetike i geometrii, MTsNMO, M., 2012

[4] S. Kublanovskii, Evklidova geometriya v zadachakh i uprazhneniyakh, SPB, 2021 (to appear)