Friday is Pi Day, a national celebration of the mathematical ... because when the perimeter is divided by its height, one gets a close approximation to 2π. It’s the same result if one divides ...

But wait: What exactly is Pi Day? And what does it have to do with ... You've probably seen it rounded down to its commonly ...

In Archimedes' day, close approximations of pi had been known for over 1,000 years. An Egyptian document dated to 1650 B.C., for example, gives a value of 4 (8/9) 2, or 3.1605. Archimedes' value ...

Tuesday is Pi Day, a national celebration of the mathematical ... when the perimeter is divided by its height, one gets a close approximation to 2π. It’s the same result if one divides the ...