Tangential Spline Curve Ends
Draw a spline curve with a tangential beginning and end.
- On the  tab, in the Lines group, click tab, in the Lines group, click Spline Spline
- Click a point on the line, arc or circle to which you wish the added arc to be tangential (A), as the starting point of the arc. 
- Select control points (B) for the line.
- Click a point on the line, arc or circle to which you wish the added arc to be tangential, as the ending point of the arc.
Note: 
    - 
        Set the tangential on or off by clicking the minimenu tangent button.  
- You can edit the line properties both before and after drawing the line.
 Spline
Spline Sketch Line Properties
 Sketch Line Properties Visibility of Geometric Constraints
 Visibility of Geometric Constraints
