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...em, and proves Euler's formula. Diamond Theory - symmetries of black-and-white tilings throw light on combinatorics and group theory. Geometry - includes a special page on constructions and plenty of sample problems to help you understand the concepts. Geometry in Motion - interact with geometric diagrams via Java Sketchpad. Alphabetical Ben Sisko's Higher Dimensional Page - contains research on higher dimensions. There are five theories and theoretical applications. Conic Sections (10) Diamond Theory - symmetries of black-and-white tilings throw light on combinatorics and group theory. Erich's Packing Center - packing geometric shapes into other geometric shapes: circles in triangles, circles in circles, and much more, plus combinatorial geometry problems. Fractal Instances of the Traveling Salesman Problem - contains resources on the evolving field of the generation of instances of combinatorial optimization problems with known optimal solution. Gallery of Mathematical Surfaces Geometry - includes a special page on constructions and plenty of sample problems to help you understand the concepts. Geometry Center - resources and reference materials from this mathematics research and education center at the University of Minnesota. Geometry Formulas and Facts - excerpts from the 30th edition of CRC Standard Math Tables and Formulas covering geometry in two and three dimensions. Geometry in Action - explore various areas in which ideas from discrete and computational geometry meet real world applications. Geometry in Motion - interact with geometric diagrams via Java Sketchpad. Geometry of the Sphere - provides basic information about spheres, looks at Girard's Theorem, and proves Euler's formula. GLaD Construction (1) Isard - downloadable, interact...