So you’re drawing away, and you’ve got two lines that need to come together to form a corner, but at the moment the lines are too short or too long. Instead of extending or trimming them, it can be quite neat to use the FILLET command with a radius of 0.
For those of you that already knew this little tip but dodged it in the past because you have to mess around making sure your fillet radius was 0, you’re in luck because you don’t actually have to explicitly set the fillet radius to 0 at all. In a similar fashion to the TRIM and EXTEND commands, you can hold down the SHIFT key to modify the behaviour of this command. As you guessed, holding down the SHIFT key during the FILLET or CHAMFER commands will force a 0 radius or chamfer.
One final note, if you’re doing this with just lines, you’ll be left with what you started with – lines. However, if either one or both of the entities are in fact polylines, they will be joined to form a single polyline. If you planned to join them afterwards this can be useful to know.