ARC allows you to create a tangent arc with a specified
radius, between two selected entities. If desired,
the selected entities can be trimmed or extended to the
intersections with the arc fillet.

Create the entity by choosing from the following options:

TRIM    - to create an arc fillet and trim the tangent 
          entities at their intersections with the fillet.

NO TRIM - to create an arc fillet but not trim the tangent
          curve entities at their intersections with the 
          fillet.
