Pyramids are triangles, because regular triangles have good stability. Stability is the key for such a huge building. The architect plans to use giant marble blocks, which are arranged layer by layer in a decreasing way, which is the most stable structure. After the site is selected, it shall be cleaned and leveled first, and then the foundation shall be laid by skilled masons. A large square marble floor will be the core of the pyramid.

Pyramids are distributed in Egypt and America, including upper Egypt, middle Egypt and lower Egypt in ancient Egypt, and now Sudan and Egypt. At present, there are about 80 pyramids scattered in the lower Nile. Different sizes, the highest of which is pyramid of khufu, with a height of146.5m and a bottom length of 230m. * * * is made of 2.3 million stones, with an average of 2.5 tons each, covering an area of 52,000 square meters. They are numerous and widely distributed. The pyramids of Memphis, the ancient city on the west bank of the Nile in the southwest of Cairo, are part of the concentration.

96 pyramids have been discovered in Egypt, the largest of which are three pyramids located in the suburb of Khufu. Because these huge tombs are shaped like gold characters of Chinese characters, we call them pyramids. At present, there are about 80 pyramids scattered in the lower Nile.