# Line Segments through the Vertices and the Circumcenter of an Acute Triangle

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Let ABC be an acute triangle, O its circumcenter, and R its circumradius. Let D, E, and F be the points along AO, BO, and CO across from A, B, and C. Then .

Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

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See the First Iberoamerican Olympiad (problem 6).