Sum of Odd Cubes is Triangular (visual proof without words) 

This is a short, animated visual proof of the formula that computes that sum of the first n odd cubes by representing cubes as n copies of an nxn array.
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This animation is based on a visual proof by Monte J. Zerger from the December 1995 issue of Mathematics Magazine (www.jstor.org/... page 371).
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