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The
value of pi
to 5 decimal places is 3.14159. Pi is an irrational number, so it cannot be expressed as an exact fraction and its decimal representation has no end.

The Greek letter pi was first used to represent the ratio of the circumference of a circle to its diameter in 1709 by mathematician William Jones.

en.wikipedia.org/wiki/Pi

Some approximations

www.geom.uiuc.edu/~huberty/math5337/groupe/digits.html

100,000 Digits

wiki.c2.com/?ValueOfPi

The

mathforum.org/isaac/problems/pi1.html

Historians estimate that by 2000 B.C. humans had noticed that the ratio of circumference to diameter was the same for all circles. This discovery hinged on the ...

www.scientificamerican.com/article/the-long-search-for-the-value-of-pi/

Mar 14, 2016

www.eudesign.com/mnems/pi.htm

Useful mnemonic rhymes for remembering the

www.cnet.com/news/amazon-alexa-echo-value-of-pi/

Nov 15, 2016

www.livescience.com/29197-what-is-pi.html

Apr 30, 2013

mathcentral.uregina.ca/QQ/database/QQ.09.08/h/mahesh1.html

search. Question from mahesh, a student: what is the exact