Attached Link: http://itctel.com/~arlateo/rightwedge.3ds

I know that Phil Cooke was just trying to be helpful with his extra primitives, but I decided to go back to Meshwork and do something that I should have done a long time ago: I drew a right triangle and extruded it along the Z-axis, then exported it to a 3DS file. I now have a solid right triangle primitive; you may download it from the link above.