Answer
I determined the problem.
The “cut path” function in Inkscape requires exactly two objects. If the user has 3 objects selected then the program does nothing.
In my case I had two concentric circles and the line, so I was selecting 3 objects.
The solution is the following:
-
Drag a guide from the ruler until it snaps to the center of the
circles -
Draw a rectangle that is larger than the circles above them
-
Extend the rectangle until it snaps to the guide (the rectangle
should now cover half the circles). -
Select the rectangle and one of the two circles
-
Do Path / Division to make a closed shape or Path / Cut to make an open shape
Attribution
Source : Link , Question Author : Tyler Durden , Answer Author : Tyler Durden