The set square/orthographic and drawing aids
Drawing aids such as the set square and parallel rule are as important to CAD drawing as they are to traditional technical drawing. Unlike the drawing board these tools are not typically evident in the interface. They are present, quite often automated, as a way to provide the user with the option of drawing a straight line vertically or horizontally or even at polar increments. From the beginning it is important to familiarize yourself with the whereabouts of these tools.
Each software provider places them differently within the interface but they all provide the same functionality. ...