Command: Ymrd

Function: Mark multiple concentric circles or arcs 
    (Note: must be small to large marked, can not be arbitrarily selected)

Location: 1. POP menu YDim -> Concentric arc
          2. Toolbar Y_Dim -> Concentric arc

Display: Enter End/?Help/ Select Object< Circle or Arc (from small to large)>:

1 Enter End - End Amrd command (right click)

2 ?Help - Function Operating Instructions

3 Select Object< Circle or Arc (from small to large)>: must be small to large marked 
   <select the circle before the dim. + %% c select the arc before the dim. + R>

 When you select a concentric circle or arc, the annotation line
   shows a straight line (inside and outside)
 Select a different circle or arc when you re-pull a straight line marked 
   the same small to large marked