Number of sides:
A gnomon is that which when added to a shape makes a larger similar shape.
For a regular n-sided polygon (shown in white), the gnomon consists of a similar polygon (black with white outline) plus a series of emanating parallelograms (red and blue).
Use the pull-down to choose the number of sides or the Play/Pause and Faster buttons to enjoy the animation. (Fast speeds might now work well depending on how your browser caches images.)
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