This is a list of topics related to pi (π), the fundamental mathematical constant.
2π theorem Approximations of π Arithmetic–geometric mean Bailey–Borwein–Plouffe formula Basel problem Borwein's algorithm Buffon's needle Cadaeic Cadenza Chronology of computation of π Circle Euler's identity Six nines in pi Gauss–Legendre algorithm Gaussian function History of π A History of Pi Indiana Pi Bill Leibniz formula for pi Lindemann–Weierstrass theorem (Proof that π is transcendental) List of circle topics List of formulae involving π Liu Hui's π algorithm Mathematical constant (sorted by continued fraction representation) Mathematical constants and functions Method of exhaustion Milü Pi Pi (art project) Pi (letter) Pi Day PiFast PiHex Pi in the Sky Pilish Pimania Piphilology Proof that π is irrational Proof that 22/7 exceeds π Proof of Wallis product Rabbi Nehemiah Radian Ramanujan–Sato series Rhind Mathematical Papyrus Salamin–Brent algorithm Software for calculating π Squaring the circle Turn (geometry) Viète's formula