Google is celebrating the 30th anniversary of the Pi Day with a delectable doodle depicting an actual apple ‘pie’! In today’s doodle, the tech giant has created an edible formula with the apple pie that gives the mathematical value of pi as a result.

For those of you who are not so sure, Pi is the ratio of a circle’s circumference (perimeter) to its diameter (distance from side to side passing through the centre). “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,” Google wrote in a blog post.

Today’s toothsome doodle has been created by award-winning pastry chef Dominique Ansel, who has paid ‘homage to this well-rounded mathematical constant’ by baking a salted caramel apple pie. After taking a look at today’s doodle, if you took want to get your hands dirty in the kitchen Ansel has given out his award-winning recipe in four simple steps. Take a look.

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**About Pi Day**

The value of Pi was first recognised by Larry Shaw in 1988, who organised large-scale Pi Day celebrations at the San Francisco Exploratorium, where he worked as a physicist. At the time, Exploratorium staff members and the public would go around the circular space in the place an eat a pie. Interestingly, Pi Day is celebrated at the Exploratorium with the same gusto till date. Around the world, Pi Day is celebrated by eating and throwing pies and holding discussions about this miraculous mathematical constant.

*Here’s how Pi Day is being celebrated around the world:*

Rain or shine… it’s π time!

Join us for our 31st annual San Francisco #PiDay Celebration at the Exploratorium—featuring π-themed activities, rituals, antics, and plenty of pie! #PiDaySF

More info: https://t.co/mTN1gnyiWY pic.twitter.com/vDqJjj9e6b

— Exploratorium (@exploratorium) March 14, 2018

During our pi day celebration, students were able to find the surface area of a pie, graph the digits of pi and discover facts about pi day! Ended the day with a friendly competition to find out who could memorize the most digits of pi. #molloylife @FWisnewski @ganley_jennifer pic.twitter.com/6OPygMDZwz

— Katharine Black (@Busybeeteacher1) March 14, 2018

During our pi day celebration, students made a collaborative Pi Day Poster, then engaged in a friendly competition to find out who memorized the most digits of pi. The winner of the day memorized digits! #molloylife @FWisnewski @Busybeeteacher1 pic.twitter.com/qFtsAoW5cK

— Jennifer Ganley (@ganley_jennifer) March 13, 2018

New video! Check out these Pizza Pi Pies in celebration of Pi Day 3.14 https://t.co/6mY2wVwB9t pic.twitter.com/nzEWEFkWj6

— Nerdy Nummies (@NerdyNummies) March 13, 2018

Happy #piday everyone!

Have some Pi Pie! pic.twitter.com/5aRA595GXw

— Scott Beamer (@Scott_Beamer) March 14, 2018

**Why is ‘pi’ important?**

Pi is an important mathematical constant. In geometry, it is used for determining the area of a circle and volume and the surface area of a sphere. In trigonometry, it is used for determining the value of sin, cos and tan function. Besides being used in classrooms, pi also has some real-life applications. Take a look:

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– It is used for tracking population dynamics.

– It is used for studying the structure of DNA.

– It is used in navigation, like GPS.

– It is used for studying the structure of an eye.

– It is used for designing clock pendulums.

– It is used in digital signal processing.

– In nature, it is used for measuring ocean waves and light waves.

*Happy Pi Day folks!*