The beautifully simple method Archimedes used to find the first digits of pi

March 14 is Pi Day in the US, as the date matches the first three digits of the famous number. On Pi Day 2015, Google announced that a researcher had uncovered the first 31 trillion digits of pi, using a cloud-based computer algorithm. Ancient mathematicians like the Greek Archimedes used clever geometry tricks to come up with earlier estimates of π.

Happy Pi Day! It’s March 14, or in American notation, 3/14, matching the

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