Prove πR² using only beads and a ruler!
I first saw this proof in an article by Russell Jay Hendel, Dowling College: http://bit.ly/LQlwQw
Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute!
Music by Nathaniel Schroeder
Thanks to Nima Doroud for contributions and to Perimeter Institute for support.