Cross's Theorem
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Construct squares on the sides of the triangle ABC. Join the outward vertices of consecutive squares to form three new triangles. Then all four triangles have the same area.
Contributed by: Jay Warendorff (April 2008)
Open content licensed under CC BY-NC-SA
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"Cross's Theorem"
http://demonstrations.wolfram.com/CrosssTheorem/
Wolfram Demonstrations Project
Published: April 2 2008