A pyramid is a building where the outer surfaces are triangular and converge at a point. The base of a pyramid can be trilateral, quadrilateral, or any polygon shape, meaning that a pyramid has at least three outer surfaces (at least four faces including the base). The square pyramid, with square base and four triangular outer surfaces, is a common version. A pyramid's design, with the majority of the weight closer to the ground,[1] means that less material higher up on the pyramid will be pushing down from above: this distribution of weight allowed early civilizations to create stable monumental structures. For thousands of years, the largest structures on Earth were pyramids: first the Red Pyramid in the Dashur Necropolis and then the Great Pyramid of Khufu, the only one of the Seven Wonders of the Ancient World still remaining and still the tallest pyramid of all. The largest pyramid ever built, by volume, is the Great Pyramid of Cholula, in the Mexican state of Puebla. This pyramid is still being excavated. he most famous pyramids are the Egyptian pyramids huge structures built of brick or stone, some of which are among the world's largest constructions. The age of the pyramids reached zenith at Giza in 2575-2150 B.C.[2] There are 138 pyramids discovered in Egypt as of 2008.[3][4] The Great Pyramid of Giza is the largest in Egypt and one of the largest in the world. Until Lincoln Cathedral was built in 1400 AD, it was the tallest building in the world. The base is over 52,600 square meters in area. However, contrary to widespread belief Sudan has the most pyramids in the world.[5] It was one of the Seven Wonders of the World, and the only one of the seven to survive into modern times. The Ancient Egyptians covered their faces with polished white limestone, though most of the stones used for the purpose have fallen or have been removed and used to build the mosques of Cairo.Video about Pyramid :
