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Kürschák's Dodecagon

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1
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move
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3
rotate
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4
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5,6
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József Kürschák proved that a dodecagon (a regular 12 -sided polygon) inscribed in the unit circle has area 3. He split the dodecagon into triangles and moved one quarter of them to complete three unit squares.
Drag all the controls to the right to move the triangles.
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