Geodesic
Triangle and biquadratic equation
Matematičeskoe obrazovanie, Tome 91 (2019) no. 3, pp. 2-6.

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

Sides of an isosceles triangle are expressed in terms of radii of the incircle and the circumcircle of the triangle. The corresponding biquadratic equation is studied.
Keywords: isosceles triangle, inscribed circle, circumscribed circle, biquadratic equation, function, function graph, asymptotes. 
@article{MO_2019_91_3_a0,
     author = {V. B. Drozdov},
     title = {Triangle and biquadratic equation},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {2--6},
     publisher = {mathdoc},
     volume = {91},
     number = {3},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2019_91_3_a0/}
}
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V. B. Drozdov. Triangle and biquadratic equation. Matematičeskoe obrazovanie, Tome 91 (2019) no. 3, pp. 2-6. http://geodesic.mathdoc.fr/item/MO_2019_91_3_a0/