The ratio of the circumference of a circle to its radius.
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The first person to calculate pi was Archimedes, around 250 B.C. Using the formula:A = pi r^2
Archimedes made pi more precise
Archimedes first used the symbol PI because he was the first one to discover it so he wanted to investigate about it.
Archimedes made pi by using the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series. From the method of exhaustion, he gave a remarkably accurate approximation of pi (3.141593). The more sides a polygon has, the closer the approximation approaches pi. Pn is the perimeter of a regular polygon with n sides circumscribed around a circle with diameter d. The formula Archimedes used to calculate pi is: pi equals limits over number of sides to infinity multiplied by the perimeter of a regular polygon divided by the diameter.
i think Archimedes was the first to discover pi (3.14) or leonhard euler by brichelle xD