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 ...

en.wikipedia.org/wiki/William_Jones_(mathematician)

William Jones, FRS (1675 – 3 July 1749) was a Welsh mathematician, most
noted for his use of the symbol π (the Greek letter pi) to represent the ratio of the
circumference of a circle to its diameter. ... "William Jones and his Circle: The
Man **who invented Pi**". History Today. Retrieved 2017-10-06. Jump up ^ Roberts,
Gareth ...

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 **...** 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
...

yousigma.com/interestingfacts/whoinventedpi.html

Aryabhattä gave an accurate approximation for **pi** (P), as 3.1416 and introduced
the inverse sine function into trigonometry.