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## Pi

en.wikipedia.org/wiki/Pi

\pi = \int_{-1}^1 \frac{dx}. An integral such as this was adopted as the definition of π by Karl Weierstrass, who defined it directly as an ...

## Definition of Pi - Math is Fun

www.mathsisfun.com/definitions/pi.html

Pi. The ratio of a circle's circumference to its diameter. Equal to 3.14159265358979323846... (the digits go on forever without repeating) A rough approximation ...

Aug 21, 2012 ... This tutorial explains the meaning of Pi. Learn Math Tutorials Bookstore http:// amzn.to/1HdY8vm Donate http://bit.ly/19AHMvX.

## A short history of Pi Day and why it's awesome. - Slate

www.slate.com/articles/health_and_science/science/2014/03/pi_day_history_perfect_symmetry_a_mathematical_constant_wave_formulas_and.html

Mar 14, 2016 ... You may not realize it, but Pi Day is a real, nationally recognized holiday. ... By definition, pi is a specific ratio, the circumference of a circle ...

## What is pi? - Definition from WhatIs.com

whatis.techtarget.com/definition/pi

Pi is a numerical constant that represents the ratio of circle s circumference to its diameter on a flat plane surface. The value is the same regardless of the size of ...

## Pi | Define Pi at Dictionary.com

www.dictionary.com/browse/pi

Pi definition, the 16th letter of the Greek alphabet (II, π). See more.

## What's the Origin of the Word “Pi”? | Dictionary.com Blog

blog.dictionary.com/pi/

Mar 13, 2014 ... March 14 marks Pi Day, the holiday commemorating the ... periphery or its Greek ancestor περιϕέρεια, meaning “circumference,” to π.

## Pi | Definition of Pi by Merriam-Webster

www.merriam-webster.com/dictionary/pi

1 : the 16th letter of the Greek alphabet — see alphabet table. 2 a : the symbol π denoting the ratio of the circumference of a circle to its diameter b : the ratio itself  ...

## Pi - definition of pi by The Free Dictionary

www.thefreedictionary.com/pi

(also pē) The 16th letter of the Greek alphabet. See Table at alphabet. 2. Mathematics A transcendental number, approximately 3.14159, represented by the ...

## PI - definition of PI in English from the Oxford dictionary

www.oxforddictionaries.com/us/definition/american_english/pi

Private investigator. Meaning, pronunciation and example sentences, English to English reference content.

Pi | Define Pi at Dictionary.com
dictionary.reference.com/browse/Pi
The world's most popular free online dictionary with definitions, spell check, word origins, example sentences, audio pronunciations, Word of the Day and more!

### Pi - math word definition - Math Open Reference

www.mathopenref.com

The number Pi, denoted by the Greek letter π - pronounced 'pie', is one of the most common constants in all of mathematics. It is the circumference of any circle,  ...

### What Makes Pi So Special? | What Does Pi Mean? - Live Science

www.livescience.com

Aug 9, 2012 ... Pi appears all over math and nature, not just in circles. ... But it turns out to be an " irrational number," meaning its exact value is inherently ...

### PI has so much meaning.......... it LITERALLY shapes our very ...

www.gamespot.com

See that? Thats PI. It may seem like just another Mathematical symbol, but the meaning behind PI is so grand, so surreal, so mind-blowing, that the full extent of  ...