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Old 12-03-2019, 08:38 AM
  #4  
bearisgray
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Join Date: May 2008
Location: MN
Posts: 24,370
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It looks like the designs are based on 18, 36, and 72 degree angles - so basically only compatible with themselves.

Or dividing the 360 degree circle by 20, 10, or 5.

Last edited by bearisgray; 12-03-2019 at 08:43 AM.
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