Hi tomot,

> Thanks! Am I correct that "Helper lines", do not work with
> the Center Arc?

They do work for locating the center point arc's position, but they don't affect the orientation of the arc.

For the arc from center point command, the orientation of the arc will be determined by the construction plane in the view that you picked the center point in (actually it is the first 2 points, you can do stuff like click the first point at an elevation in the Front view, and then switch to the Top view and pick the start point of the arc, which will orient it towards the Top view in that case), or if you snapped on to a surface (in v2) it will take the orientation from the surface.

- Michael