An Egyptian pyramid has four sides. These sides rise from a square base at an angle of 51 degrees and converge to an apex. The Great Pyramid of Cheops (Khufu) at Giza measures around 755.75 square feet at the base and originally measured 481.4 feet high.
Prior to the construction techniques being developed for smooth, four-sided pyramids, Imhotep, a royal architect, conceived of a step pyramid comprising six levels. This early pyramid still stands at Sakkara.
Smooth-sided pyramids were typically constructed as step pyramids first. The indentations were then filled with additional masonry, before the entire exterior was encased in limestone.