This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.

 RoundingRadiusis an option for Rectangle, Framed, and related functions that specifies the radius of the circle to use in rendering rounded corners.
• RoundingRadius->r specifies that corners should be drawn using a quarter-circle of radius r.
• In graphics, the radius can be specified as follows:
 r distance r in ordinary graphics coordinates Scaled[s], ImageScaled[s] fraction s of the size of the graphic Offset[d] d printer's points
• For constructs such as Framed, RoundingRadius->r always specifies the radius in absolute printer's points.
• The effective radius used for any corner is limited to the half-length of each adjacent side.
A round rectangle:
An object with rounded frame:
A round rectangle:
 Out[1]=

An object with rounded frame:
 Out[1]=
 Scope   (8)
Specify round corners:
Differently styled round rectangle edges:
Specify different rounding radii in the and directions:
The effective radius used for any corner is limited to the half-length of each adjacent side: