In math, "pi" (represented by the Greek letter π) is a mathematical constant that represents the ratio of a circle's circumference to its diameter. It is an irrational and transcendental number, meaning it cannot be expressed as a simple fraction or as a finite decimal. The value of pi is approximately 3.14159, but it is commonly approximated as 3.14 for most calculations. It is used in various mathematical formulas and equations involving circles, trigonometry, calculus, and other mathematical disciplines.
