9 Click Accept to select the first surface for filleting.
You are prompted to select the second set of surfaces.
10 Click the lower surface to select it.
The surface is selected and highlighted in yellow, and an Accept button
appears in the bottom right corner of the view.
11 Click Accept to select the second surface for filleting.
Arrows appear on both surfaces, indicating on which side of the surfaces
the fillet will be built. If necessary, tumble the view to see which direction
the arrows are pointing.
314 | Chapter 6 Modeling a Vacuum Cleaner