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High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! This page is about the history of mathematical constant . There is a summarizing table at chronology of computation of . See also history of for other aspects of the evolution of our knowledge about mathematical properties of . The earliest evidenced conscious use of an accurate approximation for the length of a circumference with respect to its radius is of 3+1/7th in the designs of the Old Kingdom pyramids in Egypt. The Great Pyramid at Giza, built c.2550-2500 B.C, was precisely 1760 cubits around with a height of 280 cubits (1760/280=2xPi). Egyptologists such as Professors Flinders Petrie and I.E.S Edwards have shown that these circular proportions were deliberately chosen for symbolic reasons by the Old Kingdom scribes and architects.