3Blue1Brown | How to derive a formula for π @3blue1brown | Uploaded 9 months ago | Updated 17 minutes ago
A link to the full video is at the bottom of the screen.
Or, for reference: youtu.be/NaL_Cb42WyY

That video explores how this question leads to a quandary on prime numbers, and how a pattern in primes allows for a clean final answer.

Editing from long-form to short by Dawid Kołodziej