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Curve Extend Curve > <Options> 
The Extend command lengthens or shortens a curve.
Commandline options
Lines, 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.
Makes an arc extension tangent to the original curve.
Extends a curve with an arc by picking the arc's center and endpoint.
Extends a curve with an arc by picking the arc's endpoint.
Makes a line extension tangent to the original curve.
Makes a smooth curve extension curvature continuous with the original curve.
Extends a curve smoothly by picking the curve's endpoint.
Decides if the extended segment will be joined or merged with the input curve.
Reverses the last action.
Rhinoceros 8 © 20102024 Robert McNeel & Associates. 16May2024