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Dr. Math Archives:Is a Square a Rhombus?Guess the Quadrilateral - Geometry Problem of the Week, April 18-22, 1994 Three Dimensions:
Animated Crystallographic Polyhedra - Steffen WeberUse interactive java applets to explore polyhedra.The Isometric (Cubic) Crystal System - John N. HuffmanExplore the shapes of crystals. |

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