Pi Day 2026: Formulas, Series, and Plots for π

Happy Pi Day! Today (3/14) we celebrate the most famous mathematical constant: π ≈ 3.141592653589793... π is irrational and transcendental, appears in circles, waves, probability, physics, and even random walks. Wolfram Language (with its built-in π constant, excellent rational support, symbolic programming, and vast collection of Number Theory functions) makes experimenting with π especially easy…