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A convex polygon without two parallel sides

Source: All-Russian Olympiad 1996, Grade 10, Second Day, Problem 7

April 18, 2013
geometry proposedgeometry

Problem Statement

A convex polygon is given, no two of whose sides are parallel. For each side we consider the angle the side subtends at the vertex farthest from the side. Show that the sum of these angles equals 180∘180^\circ.
M. Smurov