The Sketcher Extend tool extends or shortens a line or an arc to an arbitrary location, or to a target edge or point.
Shown on the left (1), the two sketch elements before the operation; in the middle (2), the line is being extended to the arc; on the right (3), the final result.
Select the Sketcher → Sketcher Tools → Extend Edge option from the menu.
Right-click in the 3D View and select the Extend Edge option from the context menu.
Use the keyboard shortcut: G then Q.
If there is a previous selection it is cleared. The tool does not accept a pre-selection.
The cursor changes to a cross with the tool icon.
Select a line or an arc.
Move the cursor in the direction to extend or shorten.
Do one of the following:
Click an arbitrary point.
To extend/shorten to another edge (Auto constraints must be enabled): Place the cursor over the target edge. When it is highlighted and the point-on-object constraint icon appears besides the cursor, click to confirm. The constraint is added.
To extend/shorten to a point (Auto constraints must be enabled): Place the cursor over the target point. when it is highlighted and the coincident constraint icon appears besides the cursor, click to confirm. The constraint is added.