The first written reference to formula_1 dates to 1900 . Around 1650 , the Egyptian Ahmes gave a value in the "Rhind Papyrus". The Babylonians were able to find that the value of formula_1 was slightly greater than 3, by simply making a big circle and then sticking a piece of rope onto the circumference and the diameter, taking note of their distances, and then dividing the circumference by the diameter.
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