Editing Solids and Surfaces - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 221

• Rotate : This option allows the rotation of faces. After selection, it prompts
for the axis of rotation and the angle of rotation. The axis of rotation, by
default, is specified by two points, with additional options allowing us to
use an existing object or define an axis parallel to the X, Y, or Z axis of
the current UCS.
• Offset : This option allows the offsetting of faces or the creation of parallel
faces. After selection, it prompts for the offset distance. A positive value
adds volume, while a negative value removes volume. If selecting con-
tinuous faces (for instance, on the common edge), faces are extended so
that the corner is corrected.