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- 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 first three digits of π.

One of the fundamental constants of mathematics, π, is the ratio of a circle’s circumference to its diameter. **See the rest of the story at Business Insider**

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**SEE ALSO: The Pi Day Google Doodle was made by the inventor of the Cronut — here’s what to know about the day**