Hello Pi has intrigued me lately after watching the following clip: https://www.youtube.com/watch?v=X3AlKU7dfOM

I believe that it would be very difficult to simply remember 20,000 digits but if there were any known exact circumference/diameter of a circle so I could just do long division in my head. Or a formula for finding digits I could just do the calculations in my head and go on forever.

Is that possible? How do computers solve digits of Pi?

I assume there is some sort of formula.

Thank you!!!