Learning to use a CAD system is similar to learning a new language. We need to begin with the basic alphabet and learn how to use the basic alphabet correctly and effectively through practice. This will require learning some new concepts and skills as well as learning a different vocabulary. All CAD systems create designs using basic geometric entities. Most of the constructions used in technical designs are based upon two-dimensional planar geometry. The method and number of operations that are required to accomplish the construction are different from one system to another.

In order to become effective in using a CAD system, we must learn to create geometric entities quickly and accurately. In learning to use a CAD system, lines and circles are the first two, and perhaps the most important two, geometric entities that we need to master the skills in creating and modifying. Straight lines and circles are used in almost all technical designs. In examining the different types of planar geometric entities, we can see that triangles and polygons are planar figures bounded by straight lines. Ellipses and splines can be constructed by connecting arcs with different radii. As we gain some experience in creating lines and circles, similar procedures can be applied to create other geometric entities. In this lesson, we will examine the different ways of creating lines and circles in AutoCAD® LT 2007.

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