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http://www.freetech4teachers.com/2015/10/an-illustrated-mathematics-dictionary.html#.VkmgAdIrKM8

Math is Fun is a free website that offers math games, puzzles, and tutorials. One of the tutorial resources that they offer is an illustrated mathematics dictionary. The Math is Fun dictionary offers more than 700 definitions of mathematics terms. All of the definitions include an illustration. Nearly 200 of the definitions include an animation. Some of the animations are interactive tutorials.