Pi is a mathematical constant that represents the ratio of a circle's circumference to its diameter. It is approximately equal to 3.14159 and is often represented by the Greek letter π. Pi is an irrational number, meaning it cannot be expressed as a simple fraction and its decimal representation goes on indefinitely without repeating. Pi is used in various mathematical formulas and equations, especially those involving circles and geometry. It is considered one of the most important and well-known mathematical constants in the field of mathematics.
