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Based on a mark in an interior chamber naming the work gang and a reference to fourth dynasty Egyptian Pharaoh Khufu, Egyptologists believe that the pyramid was built as a tomb over a 10 to 20-year period concluding around 2560 BC.Initially at 146.5 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years.The Great Pyramid of Giza (also known as the Pyramid of Khufu or the Pyramid of Cheops) is the oldest and largest of the three pyramids in the Giza pyramid complex bordering what is now El Giza, Egypt.It is the oldest of the Seven Wonders of the Ancient World, and the only one to remain largely intact.The Tura limestone used for the casing was quarried across the river.The largest granite stones in the pyramid, found in the "King's" chamber, weigh 25 to 80 tonnes and were transported from Aswan, more than 800 km (500 mi) away.
Some Egyptologists consider this to have been the result of deliberate design proportion.
unsurpassed until the 160-metre-tall (520 ft) spire of Lincoln Cathedral was completed c. The accuracy of the pyramid's workmanship is such that the four sides of the base have an average error of only 58 millimetres in length.
The completed design dimensions, as suggested by Petrie's survey and subsequent studies, are estimated to have originally been 280 royal cubits high by 440 cubits long at each of the four sides of its base.
These were carefully cut to what is approximately a face slope with a seked of 5½ palms to give the required dimensions.
Visibly, all that remains is the underlying stepped core structure seen today.
It is thought that, at construction, the Great Pyramid was originally 280 Egyptian cubits tall (146.5 metres (480.6 ft)), but with erosion and absence of its pyramidion, its present height is 138.8 metres (455.4 ft).