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en.wikipedia.org/wiki/Pi

The number π is a mathematical constant. Originally defined as the ratio of a circle's ..... 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 differences ...

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.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 ...

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

Mar 13, 2013 ... Archimedes didn't calculate the exact value of pi, but rather came up with a very close approximation—he used 96-sided polygons to come up ...

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

They used this method to find that pi was slightly greater than 3, and came up with the value 3 1/8 or 3.125 (Beckmann, 11). However, this theory is probably a  ...

www.cow-pi.com/eng/pages/who-invented-pi

Who Invented Pi? Let's say the history of pi starts around the same era as the wheel - over 5500 years ago. Who noticed that those digits go on forever?

www.dailypost.co.uk/whats-on/william-jones-man-who-invented-12739533

Mar 14, 2017 ... Born on Anglesey, the man who invented pi went from humble origins to become one of the giants of maths.