


Description :

The astroid is the path followed by a point on the
circumference of a circle of radius one unit as it rolls inside the
circumference of a circle of radius four units.
It is formed here from its tangents by laying N points equally on a
circle (the inner circle), and joining point n to the point (N/2  3n) mod N.
The strings are extended to an outer circle whose radius is 2 times
the inner circle radius.





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