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principal diagonal in convex hexagon <= 2 /\sqrt3

Source: 2004 Oral Moscow Geometry Olympiad grade 9 p6

October 27, 2020
geometrygeometric inequalitydiagonalhexagon

Problem Statement

The length of each side and each non-principal diagonal of a convex hexagon does not exceed 11. Prove that this hexagon contains a principal diagonal whose length does not exceed 23\frac{2}{\sqrt3}.