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The symbol used by mathematicians to represent the ratio of a circle's circumference to its diameter is the lowercase Greek letter π, sometimes spelled out as pi.

Math Forum: Ask Dr. Math FAQ: About Pi


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

Why is Pi (actually) Important - Angio.net


Pi (π) is the ratio of the circumference of a circle to its diameter. ... Archimedes used this trick with 96 sided polygons to correctly estimate Pi to about two digits ...

What is Pi? - LiveScience


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 ...

Pi - EnchantedLearning.com


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 ...

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


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.

Pi - Math is Fun


around the edge of 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 ...

What is Pi? What is it used for? - YouTube


Dec 30, 2013 ... It is shared for Memoriad Memory & Mental Calculation mentathletes by courtesy of CBS & CityTv. The subject is; What is Pi? What is it used for ...

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


Read all about the number pi and the mathematicians who have tried to find out ... is the symbol used for a special number which we call pi (pronounced "pie").

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


May 17, 1999 ... 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 ...

Popular Q&A
Q: What is pi? What is it used for?
A: Pi is the ratio of the circumference to the diameter of a circle. It is used in many Read More »
Source: www.chacha.com
Q: What is pi use for?
A: Pi is used for finding a circumference and area of a circle, the volume and surface area of a cylinder, and many other things. Pi is actually the ratio of a cir... Read More »
Source: wiki.answers.com
Q: In statistics what is Pi used for?
A: In statistics, pi represents the population proportion of successes. Using p, the sample proportion of successes, inferences can be made about pi, although it i... Read More »
Source: wiki.answers.com
Q: What is pi used in?
A: Geometry and trigonometry. complex analysis. Physics. statistics & Probability. Many formulas from mathematics, science, and engineering include π. Read More »
Source: answers.yahoo.com
Q: What was Pi used for in ancient times?
A: I researched it a bit into the internet and didn't find much. Pull the other one ! http://www.math.washington.edu/~greenber…. http://www.youtube.com/watch?v=scz... Read More »
Source: answers.yahoo.com