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.

Nov 17, 2025 · pi (π), in mathematics, the ratio of the circumference of a circle to its diameter. The Greek letter π was first used by British mathematician William Jones in 1706 to represent …

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 …

May 17, 1999 · Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle.

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 …

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.

Pi, represented by the Greek letter π, is the ratio of the circumference of a circle to its diameter. It is a mathematical constant with the value equal to 3.14159.

Jan 25, 2025 · Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a circle's circumference C to its diameter d: π = C/d.

Mar 14, 2023 · 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 …

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 …