Google's pie marks 30th Pi Day

Google Doodle marks 30th year of Pi Day, the date that takes its digits from mathematics constant pi

Pi, which represents the ratio of a circle's circumference to its diameter, is an important part of the foundation of mathematics.

Pi day is observed annually on March 14 (3.14), also there is an implied pun on the words "pi" and "pie". A Babylonian tablet from between 1900 B.C. and 1680 B.C. calculates pi as 3.125, and the Rhind Mathematical Papyrus of 1650 B.C., a famous Egyptian mathematical document, lists a value of 3.1605. Though modern mathematicians have calculated more than one TRILLION decimal places beyond the standard "3.14", pi is an irrational number that continues on to infinity.

Meanwhile, NASA is also celebrating Pi Day in its own special manner. 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 was created with help from Dominique Ansel, the pastry chef behind the Cronut, and leads to a search for "Pi Day".

Pi is useful in every field of science as it's used for calculations involving the volume and surface area of spheres, as well as for determining the rotations of circular objects such as wheels.

Pi Day was first recognized by physicist Larry Shaw in 1988. The challenge is in its fifth year, and features mathematical problems that can be solved using Pi.

Pi Day is an official celebration of the mathematical constant π, also represented by the number 3.14. Mathematicians adopted the symbol π for the expression in the 18th century: Welsh mathematics teacher William Jones is often credited with the first use of the symbol in 1706.

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.

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