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  • In elementary geometry, a polyhedron is a solid in three dimensions with flat faces, straight edges and sharp corners or vertices. The word polyhedron comes from the Classical Greek πολύεδρον, as poly- + -hedron. Cubes, pyramids and some toroids are examples of polyhedra. A polyhedron is said to be convex if its surface does not intersect itself and the line segment joining any two points of the polyhedron is contained in the interior or surface. A polyhedron is a 3-dimensional example of the more general polytope in any number of dimensions. Wikipedia