How Many Digits of Pi are Useful?

Trillions of digits of Pi have been calculated. Find out why this is useful. Thanks to Grinnell College math students who enthusiastically pasted one million digits of Pi on a wall! Twitter: @TPointMath Images: Meter stick: Chandra Marsono Universe: European Southern Observatory Watch: Michel Villeneuve Watch 2: Guy Sie Great circle: Nicholas Longo Binoculars: Soldatnytt Mt. Everest: Jonathan Keetly Penguin: Dux Phoenix Alvin: Taollan82 Supercomputer: ESO Dice: Doug8888 Prime numbers: Chris Pi digits collage 1: Mikl Roventine Music: "Pamgaea" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 creativecommons.org/licenses/by/3.0/

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