Geometrically, this "great" polyhedron has a polygonal base & sides which come to a common vertex
The Great Pyramid, like many other Egyptian pyramids, has a square 
base... [DOC] [TLE] Polyhedron - Topics [PAR] The word polyhedron comes from the Classical Greek , as poly- ... A 
polyhedron is said to be convex if its surface (comprising its faces, edges ... For 
example, definitions based on the idea of a bounding surface rather than a solid 
are common.