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 …

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.

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 …

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 …

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.

Mar 13, 2024 · What is the origin of pi? Pi is the Latin name of the sixteenth Greek letter, π. (Mathematic notation borrows from a multitude of alphabets and typefaces.) The first recorded …

Mar 14, 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. The circumference of a circle is, in turn, equal to …

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.

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 …

Pi is a mathematical constant with a value of 3.1415929. It is defined as the ratio of the circumference to the diameter of a circle. Learn about what is pi in math, its formula, and the …