You usually create drawings by combining and modifying several different basic shapes called primitives, such as lines, circles, and arcs, to create more complex shapes. This tutorial will help you learn how to use the AutoCAD® software to draw some of the most common basic shapes. As you work through the tutorial, keep in mind that one of the advantages of using CAD over drawing on paper is that you are creating an accurate model of the drawing geometry. In Tutorial 3, you will learn to list information from the drawing database. Information extracted from the drawing is accurate only if you created the drawing accurately in the first place.