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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, commonly approximated as 3.14159. It has been represented by ...

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: ... In fact π is not equal to the ratio of any two numbers, which makes it an irrational  ...

What is Pi? - Live Science

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

Apr 30, 2013 ... Pi represents the ratio of the circumference of a circle to its diameter. Pi is an irrational number that never ends; the decimals go on forever and ...

Learn About Pi · Pi Day

www.piday.org/learn-about-pi/

Pi (π) is the ratio of a circle's circumference to its diameter. Pi is a constant number, meaning that for all circles of any size, Pi will be the same. The diameter of a ...

PI - Math.com

www.math.com/tables/constants/pi.htm

Pi is a name given to the ratio of the circumference of a circle to the diameter. That means, for any circle, you can divide the circumference (the distance around  ...

Pi, a Very Special Number : nrich.maths.org

nrich.maths.org/2490

Read all about the number pi and the mathematicians who have tried to find out its value as ... is the ratio of the circumference of a circle to its diameter.

Value Of Pi

c2.com/cgi/wiki?ValueOfPi

Seriously, it does make sense to define "pi" as a defined constant - not because ... The text states, "the ratio of the diameter and circumference is as five-fourths to  ...

Why is Pi (actually) Important - Angio.net

www.angio.net/pi/whypi.html

Pi (π) is the ratio of the circumference of a circle to its diameter. It doesn't matter how big or small the circle is - the ratio stays the same. Properties like this that ...

MathSteps: Grade 6: Pi: What Is It? - Education Place

eduplace.com/math/mathsteps/6/g/index.html

Pi. There are many fascinating numbers in mathematics. One of the most interesting number relationships that students can discover in geometry is that the ratio ...

Where Does 'PI' Come From?

britton.disted.camosun.bc.ca/pi/piorigin/piorigin.html

You know what 'PI' is ... it's a number with the value 3.14, and it's used to find the circumference and area of a circle. But did you ever wonder where PI came ...

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What Is Pi? | Wonderopolis

wonderopolis.org

Pi is the ratio of a circle's circumference to its diameter. ... Most geometry students first encounter pi when they study circles and learn that the area of a circle is ...

Math Forum: Ask Dr. Math FAQ: About Pi

mathforum.org

What is pi ( )? Who first used pi? How do you find its value? What is it for? How many digits is it? By definition, pi is the ratio of the circumference of a circle to its ...

The History of Pi

www.math.rutgers.edu

The ratio of pi to 3 is very close to the ratio of 111 to 106. In other words, pi/3 = 111/106 approximately; solving for pi, we find pi = 3.1415094... (Tsaban, 78).