3D Sum of Triangular Numbers (visual proof without words III)
This is a short, animated visual proof showing how to find the sum of the first n triangular numbers (which themselves are sums of the first n integers) using six three dimensional stacks of unit cubes.
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This animation is based on a visual proof by Roger B. Nelsen from the November 1992 issue of The College Mathematics Journal (https://doi.org/10.2307/2686417 - page 417).
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