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They lived in the ancient country of Babylonia (or its capital Babylon) which lied along the Tigris and Euphrates rivers. This is more or less what is considered Iraq today.
This answer depends on how picky you want to be about what Babylon is (or was) historically. As a general answer the kingdom's of Babylon existed from 2,000 BC through about 700 BC (this includes all 5 eras of the empire).
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Egyptians
where did henry kelsey live
The earliest mention of pi comes from over 4000 years ago: the ancient Babylonians calculated the area of a circle by taking 3 times the square of its radius. One Babylonian tablet (ca. 1900-1680 BC) indicates a value of 3.125 for pi.