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Math » Other Math

MathTools

offers hundreds of online tools, lesson plans, and learning activities for teaching and learning math—currently for grades 2 and 7 and precalculus. Tools are offered for studying estimation, fractions, factors, patterns, percents, functions, fractals, tessellations, platonic solids, area, geometric shapes, probability, and other topics. (MathForum, National Science Foundation)

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An icosahedron where each of the 12 vertices lies on the vertex of one of three golden rectangles.

Icosahedron

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Math »  Number & Operations » 
Math »  Other Math » 

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