Interactive 3D film about a theory of the construction of the Great Pyramid of Khufu in Egypt has now migrated on to the home desktop A mouse click - and a member of a pharaoh's burial procession ...

Image caption, A pyramid is made up of a polygonal base ... It is a prism.The cross-section is a pentagon.The 3D shape is a pentagonal prism. For all polyhedra the number of edges is two less ...

Just like this one, the magnificent Pyramid of Giza ... The Pentagon is another example of a prism — a pentagonal prism, in fact, with five rectangular faces connecting two identical pentagonal ...