Another way to do it is to create an open segment, or arc, of the outside of a circle (90 degrees/270 degrees for the upper right corner are the starting and stopping points that work for me in my older version of Inkscape).
Create the square that you will be using then create a smaller version of it.
Give this smaller square a totally white fill and remove the border ('0' line width). Use this little square to cover the one corner and then take your arc and place it on top and then adjust and align. Then group the three items.
I've been following this discussion because I've always known that there ought to be a way to do this whole operation with node points and union, but I could not figure it out.
Jim Jones chineseadjuster.webs.com
-----Original Message----- From: Mr.SpOOn [mailto:mr.spoon21@...155...] Sent: Tuesday, October 06, 2009 4:46 PM To: Inkscape User Community Subject: Re: [Inkscape-user] Round single corner in a square
Thanks everybody.
The union between a rounded rectangle and a sharp one works pretty well. Thanks for the suggestion and video tutorial.