The first written evidence that has been found of people finding the value of pi is in an Egyptian papyrus and Babylonian tablets about 1900 BC, however, some historians believe that the ratio of the perimeter to height of pyramids built in Egypt as early as 2613 - 2589 BC suggests that Egyptians already had made approximations of the value of pi at that time.
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Egyptians and Mesopotamians and babylonians
If you know the length of one side - and the area... divide the area by the known side - to get the value of the unknown.
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it was when the eyptions got atttack by there enemy was when they found it out so it is sir comes alot
what is the value of sin 75 degree