Three-dimensional space - Introduction to AutoCAD 2011: 2D and 3D Design - page 354

Fig. 17.18 The UCS dialog

Constructing 2D objects in 3D space

In previous chapters, there have been examples of 2D objects constructed
with the Polyline , Line , Circle and other 2D tools to form the outlines for
extrusions and solids of revolution. These outlines have been drawn on
planes in the ViewCube settings.

First example - 2D outlines in 3D space ( Fig. 17.21 )

1. Construct a 3point UCS to the following points:

Origin point: 80,90
X-axis point: 290,150
Positive-Y point: .xy of 80,90
(need Z): enter 1