It's March 14 again...

22/7 is a lousy approximation, good to only two decimals. 355/113 is a pretty darned good approximation, good to six decimals.
 
22/7 is a lousy approximation, good to only two decimals. 355/113 is a pretty darned good approximation, good to six decimals.
And 3 is (of course) even worse! (Yet at least a couple of rules of thumb taught by CFIs rely on it.)

Anyway....

3.1415926535897932384626433832795028841971...

I think I got that right. Memorized it that far long ago, never bothered to go farther. :p
 
For you computer geeks out there, the ASCII code for π is 227 in decimal! (Hold down <Alt> key, type 227 on numeric keypad, release <Alt> key. Use 0176 for a ° symbol!)
 
There's pie..??

th
 
All together, now, for the pi cheer...

Tangent cotan cosine sine,
Three point one four one five nine!
Yeeeea, pi!
 
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