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Proof Without Words: The Circle

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

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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.
http://www.perimeterinstitute.ca

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