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Kürschák's Dodecagon
A dodecagon (a regular 12-gon) inscribed in the unit circle has area 3. József Kürschák proved this by splitting the dodecagon into triangles and moving one quarter of them to complete three unit squares.
Drag all the controls to the left to move the triangles.



For more information, follow this link about József Kürschák.


"Kürschák's Dodecagon" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/KurschaksDodecagon/
Contributed by: Sándor Kabai and Ferenc Holló Szabó
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