Geodesic
Triangles with specified values of the incircle and circumcircle radii
Matematičeskoe obrazovanie, Tome 98 (2021) no. 2, pp. 28-33

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

The analysis of triangles given by the radii of the inscribed and circumscribed circles presented in this article can be considered as an example of the successful application of a specially developed universal method for determining a triangle by its elements. 
@article{MO_2021_98_2_a3,
     author = {S. F. Osinkin},
     title = {Triangles with specified values of the incircle and circumcircle radii},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {28--33},
     publisher = {mathdoc},
     volume = {98},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2021_98_2_a3/}
}
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S. F. Osinkin. Triangles with specified values of the incircle and circumcircle radii. Matematičeskoe obrazovanie, Tome 98 (2021) no. 2, pp. 28-33. http://geodesic.mathdoc.fr/item/MO_2021_98_2_a3/