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PentaBlocks Help Students Visualize Symmetry, Congruency, and Fractions! By Sheldon Berman. These uniquely proportioned blocks allow students to rediscover the Greek's definition of the golden ratio, create the complex repeating patterns used in Escher's famous artwork, or explore a variety of other math concepts including symmetry, congruence, ratios, and fractions. Set of 245 blocks based upon adaptations of a regular pentagon includes 40 pentagons, 25 stars, 40 obtuse isosceles triangles, 60 acute isosceles triangles, 40 small rhombi, and 40 large rhombi.
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