The Wallis product for pi, proved geometrically
3Blue1Brown · 25:26
3Blue1Brown presents an original proof (found by team member Sridhar) that the Wallis product — 2/1 × 2/3 × 4/3 × 4/5 × 6/5 × 6/7 × … — equals π/2, using nothing but evenly spaced points on the unit circle, complex ro...