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Sum of Triangular Numbers II (visual proof via cannonballs)

Sum of Triangular Numbers II (visual proof via cannonballs)

This is a short, animated

Sum of Triangular Numbers I (visual proof)

Sum of Triangular Numbers I (visual proof)

This is a short, animated

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Calculating triangular numbers the fast way: visual proof

Calculating triangular numbers the fast way: visual proof

Have you always wondered why the formula for calculating

Infinite series: summing reciprocals of triangular numbers (visual proof)

Infinite series: summing reciprocals of triangular numbers (visual proof)

This is a short, animated

Proof Without Words: Sum of Triangular Numbers

Proof Without Words: Sum of Triangular Numbers

This is a short video with a quick

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Triangle numbers and Sum of odd numbers | Visual proof algebra

Triangle numbers and Sum of odd numbers | Visual proof algebra

Sum

A Multiplicative Triangular Number Recurrence (visual proof)

A Multiplicative Triangular Number Recurrence (visual proof)

This is a short, animated

3D Sum of Triangular Numbers (visual proof without words III)

3D Sum of Triangular Numbers (visual proof without words III)

This is a short, animated

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

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

This is a short, animated

Products of Odd Squares and Triangular Numbers (visual proof - updated version)

Products of Odd Squares and Triangular Numbers (visual proof - updated version)

This is a short, animated

Triangle area visual proof 2

Triangle area visual proof 2

maths #mathematics #

Triangle area visual proof 3

Triangle area visual proof 3

maths #

Sum of Natural Numbers (second proof and extra footage)

Sum of Natural Numbers (second proof and extra footage)

MAIN VIDEO IS AT: http://youtu.be/w-I6XTVZXww More links & stuff in full description below ↓↓↓ Ed Copeland and Tony Padilla ...

Triangular Numbers Modulo 3 (visual proof)

Triangular Numbers Modulo 3 (visual proof)

We present an animation of a

Triangular Numbers

Triangular Numbers

Triangular numbers

Visual Sum of Squares III (proof without words)

Visual Sum of Squares III (proof without words)

This is a short, animated

Alternating Sum of Triangular Numbers (visual proof without words)

Alternating Sum of Triangular Numbers (visual proof without words)

This is a short, animated

Odd Squares as Difference of Triangular Numbers (visual proof)

Odd Squares as Difference of Triangular Numbers (visual proof)

This is a short, animated