Web Results

Pi - Wikipedia


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 ...

What is pi used for? | Reference.com


Pi is used to find the circumference and area of a circle. It is also used to find the volume and surface area of a sphere, cone and cylinder. Pi has applications ...

Why is Pi (actually) Important


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? - Live Science


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 ...

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?

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


pi symbol. Pi (the symbol is the Greek letter π) is: The ratio of the Circumference ... There are many special methods used to calculate π and here is one you can ...

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.

What Is Pi | What Is Pi Used For | DK Find Out


Pi is a useful number that is used in mathematical formulas. It is also written as the π symbol. The number pi is usually written as 3.14. This has been rounded to  ...