Pi (π) is a mathematical constant representing the ratio of a circle's circumference to its diameter, approximately 3.14159. Known for its infinite, non-repeating decimal representation, pi has captivated mathematicians for over 4,000 years, with early approximations by ancient Babylonians and Egyptians. Archimedes advanced its calculation using polygonal approaches. Over time, pi was established as both irrational and transcendental, reinforcing its complexity. Today, pi is calculated to be trillions of digits, though only a few are necessary for practical use. Its applications span geometry, trigonometry, and calculus, emphasizing mathematics as a dynamic discipline. https://www.piday.org/learn-about-pi/#