Cutting Polygons

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This Demonstration determines if the red triangle is cut by the blue triangle. If the triangles intersect, three new triangles are calculated from the initial red triangle. This can be used to build new 3D objects by performing addition and subtraction operations on simpler objects.
Contributed by: Michael Twardos (March 2011)
Open content licensed under CC BY-NC-SA
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"Cutting Polygons"
http://demonstrations.wolfram.com/CuttingPolygons/
Wolfram Demonstrations Project
Published: March 7 2011