%0 Journal Article %A V. K. Gavrilov %T Proportional segments, a polygon, and Chevy's lines into a circle of the 7-th year students' research competence %J Matematičeskoe obrazovanie %D 2019 %P 2-8 %V 89 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MO_2019_89_1_a0/ %G ru %F MO_2019_89_1_a0