8 BIGGEST Little-Known Unsolved Mysteries of the Pyramids...youll be quite surprised at what you find.
A pyramid is a structure whose outer surfaces are triangular and converge to a single point at the top, making the shape roughly a pyramid in the geometric sense. The base of a pyramid can be trilateral, quadrilateral, or any polygon shape, meaning that a pyramid has at least three outer triangular surfaces . The square pyramid, with square base and four triangular outer surfaces, is a common version. (source : wikipedia