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Can You Solve A Puzzle That Fooled Richard Feynman?

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 Brain Teasers   |   Geometry   |   Math
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What is the radius of the circle, in simplest terms involving a, b, and c? I read that even the great mind Richard Feynman made a mistake. Watch the video to learn the common mistake and what the correct answer is.

Source Feynman story
http://web.media.mit.edu/~walter/MAS-A12/week11.html

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