The Mystery of the Disappearing Square
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Consider the eight orange triangles, four brown pieces, and four squares assembled into the large square shown. By using the slider you can reassemble them into the same large square, but with the middle square missing. Where has it gone?
Contributed by: Jaime Rangel-Mondragon (March 2011)
Open content licensed under CC BY-NC-SA
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"The Mystery of the Disappearing Square"
http://demonstrations.wolfram.com/TheMysteryOfTheDisappearingSquare/
Wolfram Demonstrations Project
Published: March 7 2011