Developing Drawing Strategies: Part 1 - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 144

increments of 90°, you don't have to be precise when selecting the
second point. You can see the point selected in Figure 4.56 is not
perpendicular; however, Ortho mode ensures that the mirror line
is drawn along the horizontal bathroom wall.
FiGuRE 4.56 Using the Shift key to temporarily enable Ortho mode to
pick the mirror line
8. Enter Y ↵ when the command-prompt reads Erase source objects?
[Yes/No] <N>: .
The flipped door is displayed, and the original one is deleted (see
Figure 4.57). The MIRROR command ends.
FiGuRE 4.57 The mirrored door and swing