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Manhole
Author:
John Golden
Topic:
Symmetry
Patrick Honner is a math teacher in New York who also takes some amazing math-inspired photos of the city. His manhole picture inspired this sketch.
http://mrhonner.com/archives/14321
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Variation Theory Parallelogram Proofs
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Poorly Drawn Parallelograms
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יישומון פרבולה
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Poorly Drawn Parallelograms 3
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