Posted by Rallaz on Feb 05, 2013; 3:49pm
URL: https://forum.librecad.org/How-to-Dimension-a-Line-tp5707547p5707552.html

Create a new drawing, draw a rectangle of 40x20, then add dimensions and all are correct.

If you draw a rectangle of 400x200 then you must modify your dimension preferences multiply all x10
found it in menu edit->current drawing preferences, dimensions tab