Who were the first people known to find the value for pi?

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.