The fillet surface has a constant radius profile and is tangent to the original surfaces.
The original surfaces are automatically trimmed to connect the edges of the fillet
surface.

The following prompts are displayed.

First and Second Surface or Region

Specifies the first and second surfaces or regions.

Radius

Specifies fillet radius. Use the Fillet grip or enter a value to change the radius.
You cannot enter a value that is smaller than the gap between the surfaces. If no
radius value is entered, the FILLETRAD3D system variable value is used.

Trim Surface

Trims the original surfaces or regions to the edges of the fillet surface.

Expression

Enter a formula or equation to specify the fillet radius. See Constrain a Design with
Formulas and Equations.