Geodesic
Remarkable triangles. Finished
Matematičeskoe obrazovanie, no. 1 (2023), pp. 7-21 
S. I. Kublanovskii; S. G. Bershadskiy. Remarkable triangles. Finished. Matematičeskoe obrazovanie, no. 1 (2023), pp. 7-21. http://geodesic.mathdoc.fr/item/MO_2023_1_a1/
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     author = {S. I. Kublanovskii and S. G. Bershadskiy},
     title = {Remarkable triangles. {Finished}},
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     year = {2023},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2023_1_a1/}
}
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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 second part of the article contains three paragraphs: 1) construction of wonderful triangles with a compass and ruler; 2) description of right-angled remarkable triangles; 3) description of integer remarkable triangles (in this paper they are called Diophantine).

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[4] S. Kublanovskii, Evklidova geometriya v zadachakh i uprazhneniyakh, SPb, 2021 (v pechati)