en.wikipedia.org/wiki/Pi

The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, ..... Liu later invented a faster method of calculating π and obtained a value of 3.14 with a 96-sided polygon, by taking advantage of the fact that the ...

www.historytoday.com/patricia-rothman/william-jones-and-his-circle-man-who-invented-pi

In 1706 a little-known mathematics teacher named William Jones first used a symbol to represent the platonic concept of pi, an ideal that in numerical terms can ...

www.scientificamerican.com/article/what-is-pi-and-how-did-it

Succinctly, pi--which is written as the Greek letter for p, or --is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's ...

www.theguardian.com/science/alexs-adventures-in-numberland/2015/mar/14/pi-day-2015-william-jones-the-welshman-who-invented-pi

Mar 14, 2015 ... 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. But who was ...

www.quora.com/Who-invented-pi-and-zero

Pie -. The history of the constant ratio of the circumference to the diameter of any circle is as old as man's desire to measure; whereas the symbol for ...

www.pcworld.com/article/191389/a-brief-history-of-pi.html

Mar 13, 2013 ... In honor of Pi Day, we bring you a brief history of everyone's favorite irrational constant.

www.math.rutgers.edu/~cherlin/History/Papers2000/wilson.html

The History of Pi. David Wilson History of Mathematics Rutgers, Spring 2000. Throughout the history of mathematics, one of the most enduring challenges has ...

www.piecouncil.org/Events/NationalPieDay/HistoryOfPies

Pie has been around since the ancient Egyptians. The first pies were made by early Romans who may have learned about it through the Greeks. These pies ...

britton.disted.camosun.bc.ca/pi/piorigin/piorigin.html

But did you ever wonder where PI came from? Did somebody make it up? Was it invented? Where does it come from!? PI is a truly magical number! The symbol ...