Uses this procedure to round –also referred to as fillet– interior or exterior contour corners.

1. Select either

   Edit > Radius Corner…

   or

   the Smooth tool

2. Select any interior or exterior contour vertex.
   Tip: When hovering over a vertex, the mouse pointer changes to a double-line cross-hair ().
   The Smooth Radius dialog opens.
3. Type a radius value, R, and click OK. The previously specified radius is the default value. The corner is redrawn as a series of points forming an arc with the specified radius.
4. Exit the radius drawing mode by either

   repeating step one

   or

   selecting some other drawing mode