Pi - Wikipedia
https://en.wikipedia.org/wiki/Pi
The number π is a mathematical constant. Originally defined as the ratio of a circle's ..... Liu later invented a faster method of calculating π and obtained a value of 3.14 with a 96-sided polygon, by taking advantage of the fact that the differences ...
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Pi Day and Albert Einstein Birthday: Why 3.14 Is Called Pi | Time
time.com › History › Education
Mar 14, 2017 - The significance of the number 3.14—the inspiration for Pi Day on March 14— was known in Ancient Greece, but it wasn't called "pi" till later.
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