Google Doodle: What is Pi day?

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The award-winning pastry chef created the doodle using actual caramel apple pies.

The International Pi Day is celebrated today, March 14th, the same day when, unfortunately, Stephan Hawking died. Because Pi is a mathematical constant it remains unchanged by the size of the numbers it's used to equate and its digits never repeat. The result comes out to be 3.14 which can extend to quite a few decimal places as mathematicians say that the divisibility continues to trillions. The Japanese 69-year-old Akira Haraguchi has become a legend among the masters of memorization after reciting 111,700 decimals of Pi in only 16 hours and 30 minutes. The Doodle represents Pi's mathematical formula-the ratio between a circle's circumference to its diameter-in pie form. Because its most elementary definition relates to the circle, pi is found in many formulae in trigonometry and geometry, especially those concerning circles, ellipses, and spheres.

The earliest proven use of a good approximation of the length of a circumference relative to the radius is 3+1/7 and it has been used at the construction of pyramids in Ancient Egypt. 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 a year ago 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.

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The Pi constant was also celebrated in music and movies.

How Many Numbers Are in Pi?

If you're the kind of person who spends all their time memorizing the infinite digits of pi, you'll be able to make quick work of Ansel's pie recipe, which calls for less than 15 ingredients.