Pi | Definition, Symbol, Number, Facts | Britannica Pi, in mathematics, is the ratio of the circumference of a circle to its diameter Because pi is irrational (not equal to the ratio of any two whole numbers), its digits do not repeat, and an approximation such as 3 14 or 22 7 is often used for everyday calculations
Pi - Wikipedia The number π ( paɪ ⓘ; spelled out as pi) is a mathematical constant, approximately equal to 3 14159, that is the ratio of a circle 's circumference to its diameter
Pi - Math is Fun Draw a circle with a diameter (all the way across the circle) of 1 Then the circumference (all the way around the circle) is 3 14159265 a number known as Pi Pi (pronounced like "pie") is often written using the greek symbol π The definition of π is: of a Circle
What is Pi? - Pi Day Pi (often represented by the lower-case Greek letter π), one of the most well-known mathematical constants, is the ratio of a circle’s circumference to its diameter
What Is Pi? Understanding the Number Symbol - Statistics by Jim Pi is an irrational number, which means you can’t write it as a simple fraction Its decimal form goes on forever and never settles into a repeating pattern No matter how far you go, the digits keep coming We use the Greek letter π to represent it
What is Pi (PI)? Mathematical Definition, History, and Applications . . . Learn about the mathematical definition, historical development, and practical applications of Pi (PI) Explore the decimal characteristics of π, digit distribution patterns, and its wide use in science, engineering, algorithms, and teaching
What Is Pi (π) in Math? A Kid-Friendly Definition Pi (π) is a special number that tells us how the distance around a circle (its circumference) compares to the distance across the circle (its diameter) No matter the size of the circle, the ratio is always the same: π = circumference ÷ diameter