# Google Celebrates 30th Anniversary Of Pi Day With Today's Doodle

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New Delhi:  Today’s Google doodle celebrates the 30th anniversary of Pi day. Pi day, observed on the 14th of March every year, celebrates the mathematical constant Pi. Pi represents the ratio of a circumference of any circle to its diameter, which has been calculated to approximately 3.14159. No matter the size of the circle, this ratio stays the same. March 14th was chosen as Pi day as the date, 3/14, represents the digits in Pi up to the first two decimal places.

The famous mathematician Archimedes used polygons with many sides to approximate circles and determined that Pi was around 22/7. The Greek letter Pi is used to symbolize the number in mathematical equations. It was first used in 1706 by mathematician William Jones and became poplar after it was adopted by Swiss mathematician Leonhard Euler.

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