Geodesic
A Sum of Angles of a Self-intersecting Polygon
Matematičeskoe obrazovanie, no. 1 (2004), pp. 78-86 Cet article a éte moissonné depuis la source Math-Net.Ru

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The problem is supposed to be investigated by school students which start to study geometry. 
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     title = {A {Sum} of {Angles} of a {Self-intersecting} {Polygon}},
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A. I. Schetnikov. A Sum of Angles of a Self-intersecting Polygon. Matematičeskoe obrazovanie, no. 1 (2004), pp. 78-86. http://geodesic.mathdoc.fr/item/MO_2004_1_a2/