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Old 04-04-2013, 07:41 PM
  #5  
Tartan
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Join Date: Mar 2011
Location: Ontario, Canada
Posts: 41,465
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If there is a formula, I don't know it. I start with a pin in the middle of one side and loosely measure around the perimeter to check that no seams land in the corners. If needed, I adjust where the strip starts.
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