Posted by perepujal on Dec 13, 2020; 7:22pm
URL: https://forum.librecad.org/How-to-draw-an-exact-semi-circle-with-the-Draw-Arc-function-tp5715215p5719843.html

I didn't fully understood this method, maybe because my poorly understand of English, but to round the end of two parallel lines I found this:
Select Arc Tangential
Tick the "Angle" box and set it to 180 degrees, hit the Enter key to activate the change.
With the mouse select one of the lines.
Then with snap to the end activated select the end point of the other line.
Thats it

If you know the distance between the lines, you could instead tick the radius box and set its value to the half of the distance, but I prefer the 180 degrees method.

Hope this helps