Napoleon's Theorem
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Construct external equilateral triangles on the sides of a triangle. The centers of the equilateral triangles also form an equilateral triangle.
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Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Napoleon's Theorem"
http://demonstrations.wolfram.com/NapoleonsTheorem/
Wolfram Demonstrations Project
Published: March 7 2011