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.