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Follow up:Even easier is a drawing [;)]  [img]http://www.easternmountainmodels.com/TrackPlans/100ft_Cord_a.jpg[/img] Looking at the drawing data it would appear that using a 100ft Cord and the resulting calculated angle is somewhat more complicated than stating the radius - be it in Imperial or Metric measures.What is the origin of the method?? ER
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