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## Pi

en.wikipedia.org/wiki/Pi

The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, ... The symbol used by mathematicians to represent the ratio of a circle's circumference ...

## Why is Pi (actually) Important

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 ...

## What is Pi? - Live Science

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 ...

## How is pi used today? | Reference.com

www.reference.com/math/pi-used-today-732a502158421572

Pi is used today in practical applications that include astronomy, physics, engineering and architecture. The task of computing pi to billions or trillions of decimal ...

## Pi Day: How 3.14 helps find other planets, and more – Light Years ...

lightyears.blogs.cnn.com/2012/03/13/pi-day-how-3-14-helps-find-other-planets-and-more/

Mar 13, 2012 ... iReporter Zeynep Rice made this pie to celebrate Pi Day. .... H/m that's units per Henry per meter, where a Henry is a unit used in electronics.

## What is pi, and how did it originate? - Scientific American

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

According to Petr Beckmann's A History of Pi, the Greek letter was first used for this purpose by William Jones in 1706, probably as an abbreviation of periphery,  ...

## Pi - EnchantedLearning.com

www.enchantedlearning.com/math/pi/

Pi is used in many calculations, including finding the circumference and area of a circle, and the volume and surface area of a sphere, cone, and cylinder. Pi is ...

## Learn About Pi · Pi Day

Pi is a constant number, meaning that for all circles of any size, Pi will be the same. ... The mathematician Archimedes used polygons with many sides to ...

## Pi - Math is Fun

www.mathsisfun.com/numbers/pi.html

all the way around the circle) will be Pi. Pi (the symbol is the Greek letter π) is: ... There are many special methods used to calculate π and here is one you can try  ...

Dec 30, 2013 ... WHAT IS PI? WHAT IS IT USED FO? Memoriad World Mental ... General Interest - Pi-Day 3-14 (1 of 4) What is Pi? Just a Ratio! - Duration: 7:16.

### Math Forum: Ask Dr. Math FAQ: About Pi - The Math Forum

mathforum.org

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

### 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. ... He used fluid dynamics and chaos theory to show that rivers tend to bend into loops.

### How is pi used in the real world? | Reference.com

www.reference.com

Pi is an irrational number engineers use in many everyday tasks, including calibrating the speedometer of automobiles. The wheels on a vehicle are circular,  ...