Command: YRar
 
Function: Draw a complementary (another part) arc

Location: Toolbar Y_line -> Complementary arc

Display: Enter End /?Help /Complement (Part) Arc:

 1 Enter end - exit end instruction (right click)

 2 ?Help - Function Operating Instructions

 3 pick the arc to produce complementary (another part) arc: select the arc object, 
   the other part of the arc automatically generate a full circle

 If the arc object is selected, the line type is the dotted line HIDDEN,
    the other arc is a solid line CONTINUOUS, the color is the layer "0" default

 If the arc object is selected, the line type is the solid line CONTINUOUS, the other arc is the dotted line HIDDEN, the color is the layer "Hidden"

 If you select another linetype, another arc is a solid line CONTINUOUS,
    the color is the default value of layer "0"