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Curve Extend Curve > <Options> 
The Extend command lengthens or shortens a curve.
Commandline options  

Type 
NaturalLines, polylines, and polycurves with a line at the end to extend are extended by line. Arcs and polycurves with arc at the end to extend are extended by same radius arc. Other curves are extended smooth. ArcMakes an arc extension tangent to the original curve. Arc optionsCenterExtends a curve with an arc by picking the arc's center and endpoint. Center steps
ToPointExtends a curve with an arc by picking the arc's endpoint. ToPoint steps
LineMakes a line extension tangent to the original curve. SmoothMakes a smooth curve extension curvature continuous with the original curve. 
Undo 
Reverses the last action. 
Rhino for Mac © 20102017 Robert McNeel & Associates. 24Oct2017