Don't you mean number triangle? Well, a number triangles are numbers such as 1, 3, 6, 10, 15, 21, etc. These numbers can form a triangle with dots. If I wasn't very clear, then go to http://en.wikipedia.org/wiki/Triangular_number
Stella009 was talking about trianguler numbers not a number triangle. I know what a Number Triangle is but I can't possibley explain it so go to
http://enwikipedia.org/wiki/Pascal%27s_triangle
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