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Old 06-14-2010, 08:05 AM
  #13  
bearisgray
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Join Date: May 2008
Location: MN
Posts: 25,197
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Originally Posted by Boopers
This pattern is very similar to "tumbling Blocks".
Similar idea - the angles are changed -

Everything is based on the idea that a four sided figure will have four inside angles that equal/total 360 degrees.
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