Triangular Numbers Modulo 3 Visual Proof

We present an animation of a

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This is a short, animated

Have you always wondered why the formula for calculating

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This is a short, animated

This is a short, animated

This is a short, animated

This is a short, animated

This is a short, animated

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Are you ready to dive into the mesmerizing world of

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This is a short, animated

Using material to develop conceptual understanding of

Visual proof

This video explains what triangular numbers are and the patterns associated with them. Two puzzles are at the end of the video ...

http://demonstrations.wolfram.com/SumOfThreeTriangularNumbers/ The Wolfram Demonstrations Project contains thousands of ...