Erected about 2900 B.c. 2. 2900 B.c. The great of Gizeh was engineering problems and undoubtedly involved P and, stone bloeks. Some mathematical The structure covers 13 acres and contains, over 2 000 000 These, stone averaging 2.5 tons, in weight very. Carefully fitted together. Side of the blocks were brought from sandstone quarries located on the other long and Nile. Some. Chamber roofs are made of 54-ton granite blocks 27 feet, 4 feet thick hauled from, a quarry 600, miles away and set 200 feet. Above und. It is reported that the sides of the square base involve a relative error of less Thai 1 / 14 000 and that the,,, Relative error in the right angles at the corners does not exceed 1 / 27 000. The, engineering skill implied by these impressive. Statistics is considerably diminished when we realize that the task was accomplished by an army, of 100 000 laborers working. For a period of 30 years.
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