Dimension Angles Greater than 180

When you want to create a dimension showing the angle between two lines, the obvious method is to pick first one, then the other.

But what if you want to dimension the reflex angle instead -- the angle greater than 180 degrees? When you pick lines, the dimension shown is always less than 180 degrees, no matter where you move the mouse.

 

 

Instead, before you pick any lines, press Enter to bring up the "specify vertex" option. Then you can choose the vertex and the endpoints of each side of the angle. Now, when you move your mouse, you'll see that the two angles available are the interior angle (as in the first image) and the reflex angle.