The Modify tools - Introduction to AutoCAD 2011: 2D and 3D Design - page 122

Select fi rst object or [Polyline/Radius/Trim/
mUltiple]: r (Radius)
Specify fi llet radius <0>: 15
Select fi rst object or [Undo/Polyline/Radius/Trim/
Multiple]: pick
Select second object or shift-select to apply
corner: pick
Command:

Three examples are given in Fig. 5.42 .

Fig. 5.41 Select Fillet from the menu in the Home/Modify panel

Original
rectangle
10060

Radius10

Radius15
No trim

Radius20

Fig. 5.42 Examples - Fillet

Examples - Chamfer ( Fig. 5.44 )

1. Construct three rectangles 100 by 60 using either the Line or the
Polyline tool.
2. Call Chamfer - click the arrow to the right of the tool icon in the
Home/Modify panel and select Chamfer from the menu which appears