Touching Polygon Concurrence
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Suppose two regular -gons touch at a corner. Join their other corners—the lines meet in a single point! This is an example of concurrence, which means that three or more lines meet in a single point. As tends to infinity, the polygons tend to circles; the meeting point is the second point of intersection of the two circles.
Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
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"Touching Polygon Concurrence"
http://demonstrations.wolfram.com/TouchingPolygonConcurrence/
Wolfram Demonstrations Project
Published: March 7 2011