Wolfram Demonstrations Project

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

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Square (Wolfram MathWorld)

Triangle (Wolfram MathWorld)

Jay Warendorff

"Cross's Theorem"
http://demonstrations.wolfram.com/CrosssTheorem/
Wolfram Demonstrations Project
Published: April 2, 2008

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Cross's Theorem

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