Poncelet's Porism

sides in the polygon
You can alter the number of sides or the center of the incircle.
Control rotation with the animation or rotation buttons.
To make a star polygon
Skip 1 2 3 4 5 vertices
The Star Polygons rotate like the original polygons and the new incircles are consistant.
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Wikipedia article on Poncelet's closure theorem
Mathworld article on Poncelet's Porism
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