Posted by Gary S on Mar 15, 2018; 2:09pm
URL: https://forum.librecad.org/Arc-in-circle-tp5715802p5715803.html

It makes a difference with the direction the arc is drawn from the start to end points. The arc is drawn counter/anti-clockwise.  If you are drawing an arc in a square from the lower right corner to the upper left, after specifying the centre and radius, place the first point at the lower right and second point to the upper left.

BTW, I'm using 2.2.0 alpha and there is an indicator (partial arc) showing the direction the arc will take.