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Proof Without Words: The Circle

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Published on May 29, 2012

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

minutephysics is now on Google+ - http://bit.ly/qzEwc6
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And twitter - @minutephysics

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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