A polygon is regular if it is uniform and its faces are all alike. The regular convex polyhedra are the five Platonic solids, which have been known since classical Greece. The ancient Greek ...

There are five platonic solids, the tetrahedron ... Image caption, 3D shapes that are non-polyhedral include cylinders, cones, and spheres. At least one face is not a polygon.

Water and oil, and some other simple fluids, respond in the same way to all levels of shear stress. These are termed ...

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MATH 4451 Euclidean and Non-Euclidean Geometry (Fall ... Topics may include: Euclidean geometry, hyperbolic and spherical geometry, platonic solids, tilings and wallpaper groups, graph theory, finite ...

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Besides the regular and semiregular solids, there are just ninety-two other convex polyhedra with regular faces. In 1966, the American mathematician Norman W. Johnson, a student of H.S.M. Coxeter at ...