Geodesic
Two geometric notes
Matematičeskoe obrazovanie, no. 1 (2019), pp. 13-21
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In the first note, consider a regular polygon. Its diagonals have a number of intersection points some of which happen to be collinear. An algorithmic method of discovering the collinearity is suggested. In the second note, a numeric measure of degeneracy of a triangle is suggested.
Keywords: diagonals of a regular polygon, collinearity of intersection points of diagonals, numerical criterion for the measure of elongation of a triangle. 
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     author = {A. M. Iglitsky},
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A. M. Iglitsky. Two geometric notes. Matematičeskoe obrazovanie, no. 1 (2019), pp. 13-21. http://geodesic.mathdoc.fr/item/MO_2019_1_a2/

[1] Yastrebov A.V., “Chislovaya mera raznostoronnosti treugolnika”, Matematicheskoe obrazovanie, 2017, no. 3(83), 51—53