How to slide and extrude I’ve been trying to slide and extrude a hexagon, but I can’t get past this simple problem. I tried to extrude an edge, but it extrudes without following the hexagon’s angle. So far, I’ve managed to do a vertex slide using C to clamp, but I cannot get this to work with extrude.
Here is a sketch of what I want to achieve.

EDIT:
As asked, I’m posting the result of the solution Marty Fouts suggested. I enabled shadows and perspective so you can understand what happens. What I did here was simply move the original hexagon edge up. Now you can see it unfortunately doesn’t intersect the shape, as intended.
The trick is to use some supporting geometry. Rather than extruding, add a face and use the knife tool to make an additional edge:


If you use 'c' with the knife tool you'll get a perpendicular edge.
Now loop slide your new edge with 'C':


If you don't want to add and then remove faces, you can select the two edges that are adjacent to the edge you want to extend and subdivide them:

then use 'f' to connect the two new vertices:

and do the loop slide:

Also, start the edge slide with 'gg' and then move the edge slightly before entering 'C' so that Blender knows which direction you want to extend in.