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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 ... The symbol used by mathematicians to represent the ratio of a circle's ...

www.angio.net/pi/whypi.html

Archimedes used this trick with 96 sided polygons to correctly estimate Pi to about two digits (3.14), proving 3.1408 < Pi < 3.1428. You can try this trick with ...

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

Apr 30, 2013 ... Pi (π), the 16th letter of the Greek alphabet, is used to represent the most widely known mathematical constant. By definition, pi is the ratio of the ...

curtiscenter.math.ucla.edu/content/pi_applications

Dr. David H. Bailey, co-discoverer of the Bailey–Borwein–Plouffe formula for pi, guest authored this post. Many presume that π is only used for geometric ...

mathforum.org/dr.math/faq/faq.pi.html

What is Pi? Who first used Pi? How do you find it? What is it for? How many digits is it?

www.newyorker.com/tech/elements/pi-day-why-pi-matters

Mar 13, 2015 ... They're calling this the Pi Day of the century: 3.14.15. ... memorized these and similar formulas for the S.A.T.s and then never again used them, ...

www.mathsisfun.com/numbers/pi.html

Pi (π). pi circle diameter. Draw a circle with a diameter (all the way across the circle) ... There are many special methods used to calculate π and here is one you ...

www.wired.com/2016/03/six-things-probably-didnt-know-pi

Mar 14, 2016 ... March 14th is Pi Day, so here are some fun aspects of Pi that you might not know. ... Here are some things you might not know about Pi. .... transmitted, cached or otherwise used, except with the prior written permission of ...

www.reference.com/math/pi-used-5fba050fbb78ef3d

Pi is used to find the circumference and area of a circle. It is also used to find the volume and surface area of a sphere, cone and cylinder. Pi has applications ...

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