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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 of pi include: Integers: 3; Fractions: Approximate fractions include (in order of increasing accuracy) ...

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

100,000 Digits of Pi Pi Logo. 3.141592653589793238462643383279502884197169399375105820974944592307816406286  ...

wiki.c2.com/?ValueOfPi

Seriously, it does make sense to define "pi" as a defined constant - not because it changes, but ... PiEqualsThree, for small values of Pi, or large values of 3.

theconversation.com/the-search-for-the-value-of-pi-55744

Mar 11, 2016 ... On the occasion of Pi Day, a look at the history of calculating the actual, and increasingly exact, value of pi (π).

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

Mar 14, 2016 ... The mathematical odyssey, plus a guide to calculating pi for yourself.

www.piday.org/million

One Million Digits of Pi. 3.... More Pi Stuff. Videos: An Irrational Auralization of 225 Digits of Pi · Videos: “Pi Rap” by Amy McConnel · Videos: Memorization ...

www.piday.org/2014/music-video-what-is-the-value-of-pi

Music Video: What is the value of Pi? March 12, 2014 · Videos · ∞ .... Post navigation. ← Pi Puzzle · A fugue on Pi → · T-Shirts ...

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.wired.com/2015/03/area-circle-value-pi

Mar 14, 2015 ... How do you find the area of a circle? Can you measure the area of a circle and use that to find a value for Pi?