Chapter 2 Creating Primitives and Composites 23 Copyright Goodheart-Willcox Co., Inc. prompts, and command options (in a drop-down list). Coordinates and dimensions are displayed in boxes called input fi elds. When command options are available, a drop-down list arrow appears. Press the down arrow key on the keyboard to display the list. You can use the pointer to select the option or press the down arrow key until a dot appears by the desired option and press [Enter]. The command line provides an alternative to dynamic input. When a command is active, the available options are highlighted and can be selected directly at the command line. As the pointer is moved over an option, the pointer changes to a hand cursor and the option is selectable. This method requires no keyboard input. Height Radius Height Radius Height Width Segment Lengths Height Radius Height Radius Number of Sides Torus Radius Tube Radius Corner Radius Radius Corner Center Center Center Start point Center Center Height Box Polysolid Cylinder Wedge Torus Pyramid Cone Sphere Figure 2-2. An overview of AutoCAD’s solid primitives and the dimensions required to draw them.