%0 Journal Article %A V. B. Drozdov %T Triangle and biquadratic equation %J Matematičeskoe obrazovanie %D 2019 %P 2-6 %V 91 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MO_2019_91_3_a0/ %G ru %F MO_2019_91_3_a0