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OA+OB+OC<BC+CA if AB<=BC<=CA (I Soros Olympiad 1994-95 Ukraine R2 10.2)

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June 6, 2024
geometrygeometric inequality

Problem Statement

Given a triangle ABCABC and a point OO inside it, it is known that ABBCCAAB\le BC\le CA. Prove that OA+OB+OC<BC+CA.OA+OB+OC<BC+CA.