Posted by dellus on Dec 13, 2020; 6:07pm
URL: https://forum.librecad.org/How-to-draw-an-exact-semi-circle-with-the-Draw-Arc-function-tp5715215p5719842.html

The method described in the 2017 post by georgesbasement will only work with the parallel lines placed on the grid, being horizontal, vertical or at 45 degrees. and having a distance that make the second point also lying on the grid, and snap to grid activated.
Otherwise it will result in an approximate semicircle only, by eye aiming.