Posted by Gary S on Jan 15, 2018; 4:59pm
URL: https://forum.librecad.org/How-to-form-an-arc-tp5715693p5715694.html

Hmm, I'm not sure what you are trying to describe.  I've attached an image - is it something like this?

More generally, if the Arc tools [] don't provide what you need, you can create some construction lines and work from the intersecting lines and /or arc centres?