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en.wikipedia.org/wiki/Pi

For other uses of **pi**, π, and Π, see **Pi** (disambiguation). ..... Jones may have
chosen π because it was the first letter in the Greek spelling of the **word** periphery
.

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

You know what '

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

May 17, 1999

mathforum.org/dr.math/problems/word_pi.html

Dec 2, 1994

blog.press.princeton.edu/2014/03/18/pi-day-where-did-π-come-from-anyway/

Mar 18, 2014

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

It is not clear how they found their approximation for

blog.dictionary.com/pi/

Mar 13, 2014

thestarman.pcministry.com/math/pi/pifacts.html

The Circle Definition of

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

Mar 13, 2013

www.ask.com/math/did-pi-come-194ed8837aff6faa

The concept of the mathematical constant

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