JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. To Apply a Concentric 2D Constraint Select the Concentric 2D Constraint tool ( Drawing > Constraints > 2D ). Select the first curve or a circular segment. Select another curve or a circular segment. The two selected curves or circular segments now have the same center point. Applying a concentric 2D constraint between elements. Left: between two circular elements / Right: between two circular segments of elements. Parent topic: Concentric 2D Constraint