Line

		The Line tool is the most basic, yet important, tool in AutoCAD.  The Line command is located on the Draw toolbar.  Lines are created in model space by selecting the start and endpoints of the line.  This is an easy way to quickly connect two parts of a drawing without having to know the specific coordinates of the beginning and end of the line. Another method, if you have nothing to work with, is to input the coordinates of each end of the line into the AutoCAD command line.  This is the method shown in the image to the right.  The first point was created at (0,0) and the second point at (5,5).  This is the same coordinate system you are familiar with from math. Parenthesis are not required when entering coordinates into AutoCAD.
		As shown in this diagram, the line command will continue on infinitely until until you end it.  The command line will continue asking for the next coordinate, even if you close your figure by entering a point you have already put in.  This is helpful if you are constructing the perimeter of an object because you aren't required to continually press the Line button to start a new line.