|A structure with 3 or more triangular-shaped sides and a base that is either a triangle, a rectangle or some other polygon. These structures have been built for thousands of years, in such diverse areas as Egypt, Mexico, North America, China and India. Pyramids have either smooth sides, like the famous pyramids in Egypt, or stepped sides similar to those built by the Mayans in Mexico. | |A structure with 3 or more triangular-shaped sides and a base that is either a triangle, a rectangle or some other polygon. These structures have been built for thousands of years, in such diverse areas as Egypt, Mexico, North America, China and India. Pyramids have either smooth sides, like the famous pyramids in Egypt, or stepped sides similar to those built by the Mayans in Mexico. |