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 minutephysics is now on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics 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 Created by Henry Reich

LicenseDefault YouTube License

More videos by this producer

KSPG/Rheinmetall Automotive Imagefilm Future engine

With this Video, KSPG gives a vision into the future of the combustion engine. This video has been made under the old branding KSPG. The company has been renamed into Rheinmetall Automotive in September 2016. ..........................................................................................

The Climate Crisis - #GreenGeneration

The Earth has an illness called climate crisis. It causes the extinction of species, desertification and pandemics, and many other natural disasters. This illness has been caused by humans, with our polluting vehicles and industries that cause global warming. Green Generation, the #animation series