Anglesey-born William Jones was the first person to use the Greek letter π for the ratio of a circle's circumference to its diameter.
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It is a decimal
Pi is approximately equal to 3.141592652389793238462.
That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.
Pi is a single number so there cannot be famous numbersof pi.
pi, in the mathematical term.