So I can place arc length dimensions just fine as you can see from the attachment.  Trouble is, after awhile the dimension wishes to show the length of the outside arc instead of the inside.  Looking at the diagram, the first four dims (9 1/2  thru 35 13/32) are fine but I can't get the 112 9/32 dim to go to the inside no matter what I do.  Is there a trick I'm not aware of?