JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. To Apply a Parallel 2D Constraint Select the Parallel 2D Constraint tool. Select a linear or an elliptical segment. Select another linear or an elliptical segment. The two selected segments are now parallel to each other. In case of elliptical segment, the axis of the ellipse participates in the process. Note: For two segments to be parallel, they must be on the same plane. Parent topic: Parallel 2D Constraint