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Successive Averages of the Vertices of a Polygon
If the vertices (thought of as vectors) of a polygon are , then the midpoints of the sides are . These new points form the vertices of another polygon, and the midpoints of its sides are . This process can be repeated for iterations.
There is another variable, , the number of successive points around the polygon that can be averaged. Here are the next two initial averages (and ):
The original seven points are scattered randomly. For clarity, drag them to form a convex or star-shaped polygon and experiment with the controls.



"Successive Averages of the Vertices of a Polygon" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/SuccessiveAveragesOfTheVerticesOfAPolygon/
Contributed by: George Beck
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