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How Many Triangles Are There? Learn The Formula For Any Size!
How many triangles are formed in a grid of equilateral triangles with N triangles in its base? The video shows a pattern in the case of n=4 and presents a formula for the general case. Blog post (text explanation): http://wp.me/p6aMk-4sO There are many ways to prove the formula, links in this stackexchange discussion: http://math.stackexchange ...
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