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## Pi - Wikipedia

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

circle radius=1, half circumference=pi. Draw a circle ... is 3.14159265... a number known as Pi ... pi symbol. Pi (the symbol is the Greek letter π) is: The ratio of the ...

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

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

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 ...

## What Is Pi? | Wonderopolis

wonderopolis.org/wonder/what-is-pi

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 ...

## 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 ...

## 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 ...

## Value Of Pi - C2 Wiki

wiki.c2.com/?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  ...

## 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 (π) explained visually - Setosa

setosa.io/ev/pi/

The last line in the article is pointing out that we could've just as easily have used the ratio C/R (circumference over radius) in the place of pi in almost every ...

## Ratio of circle's circumference to its diameter - MATLAB pi - MathWorks

www.mathworks.com/help/matlab/ref/pi.html

This MATLAB function returns the floating-point number nearest the value of π.