Pi is an irrational number with an infinite amount of decimals. While 3.14 is good enough for high school students and most engineers often use 4.0 just to be sure, there are actually a lot of uses for the rest of the decimals, primarily in cryptography. These days we know pi down to tens of trillions of decimals, but not too long ago calculating a few dozen could literally take a lifetime. Many people in history spent years of their lives calculating a few decimals of pi, using a method…
