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Is a Point Inside or Outside a Regular Polygon?
This Demonstration determines whether a point is inside or outside a polygon by summing the angles between adjacent vertices and the point in question. If the sum is (approximately) , the point is inside; otherwise, it is outside.



For more information, see the Wikipedia entry for Point in polygon.

"Is a Point Inside or Outside a Regular Polygon?" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/IsAPointInsideOrOutsideARegularPolygon/
Contributed by: Jon Perry
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