Pi Day Explained: The History of the Number Pi, Surprising Facts About π, and What Happened When I Celebrated by Getting Pied in the Face
Pi Day… or Pie Day? (And Yes, I Got Pied in the Face)
March 14th rolls around every year and suddenly people start talking about Pi Day. If you’re not a math person, the first time you hear about it you probably think it has something to do with dessert.
Honestly… that’s what I thought at first too.
But Pi Day is actually about π (pi), the famous number used in math when dealing with circles. The date 3/14 matches the first digits of pi, 3.14, which is why March 14th became the unofficial holiday for it.
Of course, if there’s a holiday that sounds like Pie Day, it almost feels wrong not to involve actual pies somehow.
So that’s exactly what I did.
I made a video where I talk about Pi Day and some interesting facts about it… while also risking getting pied in the face a few times.
You can watch the chaos here:
But before you watch, here are a few things that make Pi Day a little more interesting than it might seem at first.
The Number Pi Is Actually Pretty Weird
Pi is the number you get when you take the distance around a circle and divide it by the distance across the circle.
No matter how big or small the circle is, the answer always ends up being the same number.
That number starts as:
3.1415926535…
And then it just keeps going forever.
The digits never repeat in a predictable pattern and they never end. That’s why pi is called an irrational number.
Most people round it to 3.14, which is good enough for everyday math. But mathematicians have been obsessed with calculating more and more digits of pi for centuries.
With modern computers, scientists have now calculated over 100 trillion digits of pi. At that point it’s less about practical use and more about seeing how far it can go.
People Have Been Studying Pi for Thousands of Years
Pi might feel like a modern math thing, but people have actually known about the relationship between circles for a very long time.
Ancient civilizations noticed that if you measured circles carefully, the ratio between the circumference and the diameter stayed almost the same every time.
Ancient Egypt
One of the earliest known estimates of pi comes from an Egyptian mathematical document called the Rhind Papyrus, written around 1650 BC.
Their approximation worked out to about 3.16, which is surprisingly close considering they were doing this thousands of years ago.
Archimedes Got Even Closer
Later on, the Greek mathematician Archimedes tried to pin the number down more accurately.
He used a clever geometric approach involving polygons inside and outside of circles. By increasing the number of sides, he narrowed down the value of pi.
His estimate placed pi between 3.1408 and 3.1429, which is incredibly accurate for something done over 2,000 years ago.
The First Official Pi Day
Pi Day as an actual celebration didn’t show up until 1988.
It started at the Exploratorium science museum in San Francisco, where physicist Larry Shaw organized a small event centered around the number pi.
The celebration included a walk around a circular space, math activities, and — fittingly — eating pie.
That tradition stuck, and over time Pi Day became something schools, math clubs, and science enthusiasts celebrate every year.
In 2009, the U.S. Congress officially recognized March 14 as National Pi Day.
People Take Pi Pretty Seriously
Some people celebrate Pi Day casually with pie and math jokes.
Others go way further.
There are competitions where people try to memorize as many digits of pi as possible.
The current record holder has memorized over 70,000 digits of pi.
Just thinking about that makes my brain hurt.
For most of us, remembering 3.14 is probably good enough.
Why I Decided to Celebrate With a Pie Challenge
Once I realized Pi Day and pie were connected historically anyway, it seemed like the perfect excuse to make a video out of it.
The idea was simple:
Talk about the origins of Pi Day, share some facts about the number, and mix it with the possibility of getting pied in the face.
Because let’s be honest — math explanations get a little more interesting when whipped cream might be involved.
And things did get messy.
If you want to see how it turned out, you can watch the video here:
A Few Quick Pi Facts
Here are a few random facts about pi that people sometimes don’t realize.
It’s one of those numbers that quietly shows up all over science and math.
So… Pi Day or Pie Day?
Honestly, it can be both.
You can celebrate the math side of it, learn a few things about circles and history, or just enjoy the excuse to eat pie.
Or, if you’re like me, you can do both at the same time and see what happens when a math explanation meets a flying pie.
If you want to see how that experiment went, the video is here:
Just be prepared… it gets messy.
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