Eli5: I always thought pi is 22/7, but recently i found out that 22/7 is a number that is pretty close to pi, not pi itself. Then how do mathematicians found more “pi” ?

Question

Eli5: I always thought pi is 22/7, but recently i found out that 22/7 is a number that is pretty close to pi, not pi itself. Then how do mathematicians found more “pi” ?

In: 167

Answer 1

This video from Veritasium does an amazing job to explain how it was calculated throughout time.

At first, painstakingly where it would take years of calculations to get more precise.
After Newton, it became so easy that you can do a lot of digits in a day.