24 September 2011

"Johnson Circles"

If three hula hoops cover a common point, then a fourth hoop will cover their remaining intersections.

Found in the Futility Closet.  There is an explanation at Wolfram Mathworld.

2 comments:

  1. AnonymousSeptember 24, 2011 at 11:21 PM

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  2. AnonymousSeptember 25, 2011 at 7:44 AM

    a uTube summary of Johnson's Theorum presented with the usual uTube anoyances: http://www.youtube.com/watch?v=_6NiDyx7llk

    Enjoy!

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