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The Mystery of the Disappearing Square

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?

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"The Mystery of the Disappearing Square" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/TheMysteryOfTheDisappearingSquare/
Contributed by: Jaime Rangel-Mondragon
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