http://demonstrations.wolfram.com/DrawingAnOvalWithAStringAndThreeNails
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
It is commonly known that you can draw a circle using a pencil, a nail, and a loop of string: moving the pencil around the nail while holding it taut against the loop maintains a constant radius around the nail, and the resulting figure is a circle with...
Contributed by: Robert Dickau
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