Counting Balls, Squares, and Triangles

Описание к видео Counting Balls, Squares, and Triangles

This is an interesting counting problem in mathematics.

In the video I'll show the relationship between ♦ the tetrahedral numbers, ♦ the number of squares (any size) in a staircase of n steps built with unit squares, and ♦ the number of triangles (any size) in a triangular matchstick arrangement of side n.

The associated webpage is: http://b3d.drjimo.net/yes-3d/staircas...
The webpage has GeoGebra and Desmos links.

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