Following on from:
These two are worth a watch....
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I love Numberphile. Even if i often don't understand anything 
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Here is mine 
Most smartest of all.
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Here are some math forumlas to calculate pi. Give them a try.
Using Inverse Sine function (asin) - take any number x between -1 and 1 since the domain of inverse sin is [-1,1].
- 180 degree in radians is equal to PI
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The App Inventor system "floats" all decimal places to 5 decimal places - 0.123456 would become 0.12345. So, I simply ran a JavaScript dialog, because Java(Script)'s Math.PI operator has 15 digits.
Just this:
alert (Math.PI);
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Went online, found one million digits of pi.
Taken a large part from the website, if you are the author of the website, large thanks!
Made an AIA, tested successfully.
PiWithFiles.aia (41.6 KB)
I do not know how many digits I took, seems to be thousands.
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tasty... 
Very Nice Inforemations about Pi π here
Great to hear read...
if I scroll until end of that page, then my mouse would never work again I guess
Woah, an API for π nice
never imagined...
it probably costed him to host it 
, great guy though
Yeah, better and nice actually @gordonlu310
Sometimes I really like maths 
the actual full sentence was: I like maths only sometimes because I hate it a lot , btw, I can't make text even smaller as I wanted
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I went on Google and found a list of URLs to images related to π and pie, and made a JSON list to put this together.
RandomPieImages.json (2.9 KB)
Together with this solution of calculating Pi, you can also use these to show a random pi(e) image.
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This is a game about pi(e). Let me briefly introduce it.
-
It has a pie (ImageSprite) on a canvas that is clickable. When you click it, you earn 1
. -
The game has a time limit of 3 minutes and 14 seconds.
-
I am generous enough to give you 10
at the start of the game. -
You can potentially lose
over time:-
For every 80 seconds, Tax Token will tax you 25
. -
At 1:34, Judgemental Owl will judge you, and will take away 30
from you (because he a corrupted judge). -
At 1:04, a macaw will fly to your wallet, and will decide whether to take away
, leave it alone or even give you .
-
-
After 3 minutes and 14 seconds, the time is up. If you earn 628
or more, you pass, else you fail the challenge.
How is it related to pi?
-
The sprite is a pie.
-
The time limit is 3.14, an approximation of pi.
-
The target of the score you earn is 628, which is approximately pi times 2 times 100.
Enjoy, and let me know if there are any bugs! Also, share your score below! AIA below.
PieClicker.aia (245.2 KB)
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Good job. Maybe post some screenshots of your game.
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That's unfortunate...I find that my score becomes > 628 only if I click the pie with 2 fingers. It was desgined to be a challenge...
Anyways, here are some screenshots.
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I did it with a emulator. So a lot of mouseclicks
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Happy Pi Day! 
3 years ago we had a lot of fun. Maybe some of you discovered other ways to calculate Pi.
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Here's a comedic Pi calculator based on a screen grab from @Peter's post.
Will it fool your math teacher?
pi_in_your_face.aia (2.2 KB)
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Here's a comical way to calculate Pi, by using two objects on a friction less plane:
It'd be cool if someone could write an App Inventor app, mimicking simple collisions on friction less plane of two objects, leading to calculation of Pi.
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