Opposite Rotations of Frame Segments
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The marked segments of the frames form triangles if aligned.
Contributed by: Michael Schreiber (August 2015)
Open content licensed under CC BY-NC-SA
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"Opposite Rotations of Frame Segments"
http://demonstrations.wolfram.com/OppositeRotationsOfFrameSegments/
Wolfram Demonstrations Project
Published: August 5 2015