Pi Day Google Doodle Celebrates 30th Anniversary

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Google has listed all the ingredients, along with a behind-the-scenes of today's doodle.

Google teamed up with Dominique Ansel, creator of the cronut, to create the Google doodle celebrating the 30th anniversary of Pi Day, on March 14. On Pi Day's 30th anniversary, Google has honoured the day by creating a pie-themed doodle as the number has a delicious sounding name. Google Doodle celebrated International Pi Day, which also marks the birthday of renowned theoretical physicist Albert Einstein.

The Google letters in the doodle are constructed from pastry, butter, apple and orange peels.

Pi is an irrational number that extends to infinity, but is approximately equal to 3.14 (hence celebrated on the 14th day of the third month) or 22/7. The day looks like 3/14 for those that write dates in the month/day format, like in the US. Pi Day honours the mathematical constant, Pi - which is notated by the Greek letter "p".

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In geometry, "Pi" plays an important constant in finding out the area of a circle.

The symbol was first used in 1706 by William Jones. The rise of computing technology has led to an arms race of sorts to calculate ever more digits of pi: the current record was set past year by Christian physicist Peter Trueb, calculated pi to 22.4 trillion digits - 22,459,157,718,361, to be exact - outpacing the previous record set in 2013 by 9 million digits.

Pi is a fundamental element of many mathematical fields, but most significantly Geometry.

The use of Pi became popular after it was adopted by the Swiss mathematician Leonhard Euler in 1737.