A Rotating Hinged Parallelogram

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One of the vertices of a hinged parallelogram is fixed while two of the sides joined to it rotate in opposite directions, not necessarily with the same speed. This Demonstration shows the path taken by the opposite vertex for a setting of the speeds and the length of the parallelogram.
Contributed by: Jaime Rangel-Mondragon (March 2011)
Open content licensed under CC BY-NC-SA
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"A Rotating Hinged Parallelogram"
http://demonstrations.wolfram.com/ARotatingHingedParallelogram/
Wolfram Demonstrations Project
Published: March 7 2011