Extend Segment to Line Extend To

TOP_Extend Seg
Extending lines to other lines by
clicking on 1, 2, then on 3, 4, and
finally on 5, 6.
TOP_Extend Seg
Extending a spline to a circle by clicking on 1 and 2.

This tool extends an open line, spline, or arc to its point of intersection with another line, spline, or arc. To apply the tool first click on the line to be extended and then on the line that intersects it. See examples.