Is there any way to draw dotted or dashed lines in SketchUp ?
Try my 2dLineStyle SketchUp Plugins | PluginStore | SketchUcation
draw a line (or an arc).
right click on it.
choose ‘divide’
type in an odd number, eg 5
your line is now split into 5 segments
erase the 2nd and 4th segment of the line.
Hurrah