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When measuring the angles on an arc, I have not found it possible to get LibreCAD to print an angle greater than 180*, even though that is the value I am interested in for my drawing.
If I try moving the cursor to the outside area, the program draws the extra lines for the corresponding angle, and gives the smaller value. It doesn't matter in what order I select the two lines of the angle.
I will grant that it is always possible to calculate the value of the opposite angle by subtracting from 360*, but the extra manual step shouldn't be needed.
The better program behavior IMHO would be for the program to give the value for the angle that matches the cursor position - i.e. 180* if it is outside the angle.