# World day of Pi: what you need to know about this strange number

|This Thursday, march 14, is celebrated the world day of Pi (π), the irrational number to the digits in infinite decimal. An employee of Google has been able to calculate billions of billion, smashing the previous record.

If you know how to say a date in English, you will understand why the world day of Pi (π) falls on Thursday: 3/14 or march 14, upside down.

Whether you love mathematics or not, we all necessarily heard of Pi 3,1415… But what is this number? How many decimal places are you able to calculate?

At this last question, an employee of Google has recently given a new answer: 31.4 billion billion.

The american giant has revealed this Thursday that Emma Haruka Iwao took four months to arrive at this result, smashing the previous record was “only” 10 billion billion.

Pi is also called the constant of Archimedes and the name of the famous Greek science, which has developed a method of framing an extreme precision.

The exact definition of Pi, given by the *Larousse dictionary*, is the following: *“Real transcendent noted π, which is the ratio of the circumference of a circle to the length of its diameter”*.

Note also that Pi is an irrational number. That is to say that it is impossible to express it in the form of fractions.

In the life of every day, this number (irrational) is not used for large-thing. But in mathematics, Pi finds applications in geometry, in the formulas (such as integrals, for example), and also in probability or statistics.

**See below for the first 700 decimations of Pi (and thousands of others on the following site jlsigrist.com) 3,…:**

1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172 5359408128 4811174502 8410270193 8521105559 6446229489 5493038196 4428810975 6659334461 2847564823 3786783165 2712019091 4564856692 3460348610 4543266482 1339360726 0249141273 7245870066 0631558817 4881520920 9628292540 9171536436 7892590360 0113305305 4882046652 1384146951 9415116094 3305727036 5759591953 0921861173 8193261179 3105118548 0744623799 6274956735 1885752724 8912279381 8301194912 9833673362 4406566430 8602139494 6395224737 1907021798 6094370277 0539217176 2931767523 8467481846 7669405132 0005681271 4526356082 7785771342 7577896091 7363717872 1468440901 2249534301 4654958537 1050792279 6892589235…

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