I have found by manipulating the zoom or scale, many things show up in arcs, right angles and perpendicular diagonals (crossing X's). If they make it so the angle tool can keep the anchored points BUT change degree with the zoom without the anchors shrinking or going off the page with the line it would be a bonus. It would be good to have 2 options for the tool. First it always kept it's angles as it is now (no matter what the zoom). Second it would keep it's anchored points and change degrees with the zoom. The second option would allow 90 degree relations and reflected angles to show up. To have them light up, or display in some way, when they did this would be even better.