Proportional Triangle Nesting
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Six initial triangles are transformed in steps by one of the 23 four-piece dissections of a triangle. Change the proportions of that dissection and observe the emerging rotation by lines or polygons.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Proportional Triangle Nesting"
http://demonstrations.wolfram.com/ProportionalTriangleNesting/
Wolfram Demonstrations Project
Published: March 7 2011