CORNERS allows you to create a line rectangle by 
indicating positions for two opposite corners of the
rectangle.

Indicate a position for one corner of the rectangle, using
a Position Menu option.

Indicate the opposite corner of the rectangle, using a
Position Menu option.

The rectangle is created and consists of four separate 
(non-associated) line entities. 

Regardless of the 2-D/3-D construction switch setting, the
rectangle is created in the current construction plane.

Create another rectangle by indicating different positions
for opposite corners, or exit the option by pressing the
<Esc> key.

