9478

Cross's Theorem

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.

THINGS TO TRY

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PERMANENT CITATION

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