This is the only pi I have any interest in.  Let me know when it is conjugate a verb day.

Hmm. Make mine cherry.  What's the question?

Pi represents the ratio of a circle’s circumference to its diameter. It’s an important part of the foundation of mathematics, most importantly geometry, where pi is key to equations calculating the area of a circle, A = πr2, and the volume of a cylinder, V = πr2h.

Touche` The only pie that I want is the one Richard Weeks has offered.

It's the way to defeat any super computer, just ask it to compute Pi to the last digit.  It defeated several evil computers in Star Trek.

It is the circumference of a circle divided by it's radius, if memory serves, and the only known number that has no end.

In high school the math department always celebrated the day by bringing in pies for the students.  When I was traveling for work back in 2007, I was on a 3 week stint at an extended stay hotel in Medford, Oregon.  That hotel had a weekly get together for the guests where they brought in food and drinks and everyone mingled and it was a very pleasant experience that was one of the highlights of my week.  One such get together happened to fall on March 14th, so I went and got a chocolate mousse pie from the local Marie Calendars and some icing and made a "happy pi day" pie with as many digits of Pi around the outside as I could fit.  I'll have to hunt down a photo, couldn't find it but know I have it somewhere.

Key Lime from Gandy's.

Now, where is my slide rule.

I would love a Key Lime Pie, it's the best!

If you're asking The Rock? It's poontang pie! LOL
I do know the answer to what you're asking. But it doesn't matter! The Rock Says!

Having been in a sorority in college, I do know all the greek letters.

The number π is a mathematical constant, the ratio of a circle's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes spelled out as "pi"

Thank you Google.

Any good mathematician knows that and knows it goes on and on and on and on....

3.14, a number that I use often.

I know it is 3.14 and has something to do with the calculation of a circumference! 

3.14...had to fix it! No idea how that 7 got in there...

Praful,

I like Richard Weeks version, make mine pecan or apple.  Constant number for figuring out circumference.  So people find it intriguing that Stephen Hawking died on Pi-Day.

Michael Jacobs nailed this one!

perhaps the most popular of geeky mis-guided holidays

Well, my first degree was an engineer as well, so I still remember. 

When my kids were in school, we always celebrated this day with lots of

Pi- related activities: March 14 = 3/14. Pi is 3.14159265359....

I bought a few to slice from Maine. Ought to be cool enough. It's hi time for pie time.

I feel like custard today although you can never go wrong wth chocolate. I will take 3.14 of them too

      Publix (supermarket) is giving away free slices of key lime pie today.   To compute the circumference of that key lime pie, multiply the Radius times 2 times Pi.  To get the area multiply the radius times Pi and square it.

I know I learned itbut no one could ever really tell me how I was going to use it in every day life. So other than knowing it is 3.14.... not much else.

I love banana cream .... well, peach or pecan will do as well :)

According to TIME, here's a quick Facebook video on what Pi & Pi-Day mean. - Tim

Ask Michael Jacobs - I think it is cherry 

it's used in determining the circumferance of a Circle.... C=Pi R squared....

pi is 3.14....

Praful Thakkar 3.142 rounded to three places.

In math or in a restaurant?

I love pie .... thanks for asking.

My husband is also an engineer. My Dad is a phycisist and mathematician. I know Pi.

I am sure you got the answeer several times

I thought it was pie day not pi day! Either way it can be a math thing addding pounds if you eat pie.

It's Greek to me!

It could be used to express urination depending on pronunciation 

Cherry pie for sure.

Pi is a simple question ....depending on your desired answer

It's the sixteenth letter of the Greek alphabet 

Also the ratio of a circle's circumference to its diameter

As well as the MATH CLUB CHEER

Sine, Cosine, Cosine Sine, Three point one four one five nine! Yaaaaaaay MATH!

https://youtu.be/OjyZKfdwlng

I was laughing - as I was thinking of what Richard was thinking! 

Many good responses allready. Great question!

That is how I remember my niece's birthday.