 "Pyramid of Cheops" or "Khufu's Pyramid", near Cairo, the farthest north and east of the famous trio, often the pyramid in back in the classic picture. Ancient Egyptian, Fourth Dynasty. "The pyramids at Giza—descendants of primitive 'stepped' prototypes built in superimposed layers—are gigantic prisms unique in world architecture, mathematics at an ultimate scale. It is quite possible that Cheop's Great Pyramid consumed more dressed stone blocks than any structure ever built, an estimated 2,300,000 of them, averaging 2.5 tons each. It is generally thought that the blocks were moved on log rollers and sledges and then ramped into place."
Details
Khufu or Cheop's Great Pyramid is 756 feet (241 meters) square in plan, and 481 feet (153 meters) high. The angle of inclination of the triangular faces is about 51.5 degrees. The square of its height equals the area of each triangular face, as determined by Herodotus in 450 B. C. The base of the pyramid covers about 13 acres.
The other two pyramids in the famous trio are Khafre, 704 feet (214.5 meters) square, 471 feet (143.5 meters) high, with a face inclination of 53.2 degrees, and Menkaure, 345.5 feet (110 meters) square, 216 feet (68.8 meters) high, with a face inclination of 51.3 degrees (or possibly 330ft wide and 206 ft high (105m x 65.5m)).
For ease of modeling the pyramids, it may be useful to also know the triangular face height for each as measured along the surface instead of vertically. According to trigonometry, these surface face heights are: Khufu, 612 feet (195 meters); Khafre, 588 feet (179 meters); Menkaure, 276.6 feet (88 meters) (or possibly 263.6 feet (84m)). |
