Extend
Extend or shorten an entity of a sketch curve.
- 
                Click the Extend icon.

 - Click an entity to select it.
 - 
                Move the mouse to preview the extended or shortened entity, and then click to
                    extend or shorten the entity.
                Tip: If in the previous step you selected an entity (A) that intersects with another entity (B), you can click B near the intersection point to extend or shorten A at that intersection point.
Table 1. Example 1: Extend 
                                        Figure 1. Select Entity "A" (Line)
                                        Figure 2. Click Entity "B" (Arc) Near the Intersection
                                                Point
                                        Figure 3. "A" Is Extended to the Intersection PointTable 2. Example 2: Shorten 
                                        Figure 4. Select Entity "A" (Line)
                                        Figure 5. Click Entity "B" (Arc) Near the Intersection
                                                Point
                                        Figure 6. "A" Is Shortened at the Intersection
                                                Point - Right-click and mouse through the check mark to exit, or double-right-click.
 
Tip: 
                
        - This tool does not currently work on Splines.