I want to create a function that labels the angles of a polygon. The arcs (and for right angles, squares) that mark the angles should not scale with the polygon, neither should the user have to specify their size each time. The same goes for labels. I want to put labels beside each mark, which is simple using cat', but the separation between the arc and the text shouldn't have to be hardcoded.

I want to be able to make stuff using Measures, just like fontSize, lineWidth, etc. But I can't figure out how to do this. ScaleInv might help, but I want the marks' size to change dynamically with the size of the output.