Sums of Sums of Squares (visual proof) 

This is a short, animated visual proof for the sum of the sum of squares formula using a wonderful visual proof computing the sum of squares formula.
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Here is a link to the visual proof for the sum of squares:
• Sum of Squares I (visu...
Here are other visual proofs about the sum of squares formulas:
• Summing Squares IV (vi...
• Visual Sum of Squares ...
• Sum of Squares II (vis...
• A Sum of Squares Doubl...
• An Amazing way to Sum ...
This animation is based on a visual proof by C.G. Wastun according to Roger Nelsen in his second Proof without Words compendium (page 91) : bookstore.ams....
This first visual proof animation is based on (independently discovered) visual proofs by Dan Kalman from the March 1991 issue of The College Mathematics Journal (www.jstor.org/...) and Martin Gardner from the October 1973 Scientific American (www.jstor.org/....
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