create a line

With LINE, you can create a series of contiguous line segments.
Each single line segment can be edited separately from the other line segments in a series. You can close a sequence of line segments so that the first and last segments are joined.
You can assign properties to lines including color, linetype, and lineweight. For more information about properties, see Control the Properties of Objects.
You specify the locations that define the endpoints of each line with precision. You can
Enter the coordinate values for an endpoint, using either absolute or relative coordinates
Specify an object snap relative to an existing object. For example, you can specify the center of a circle as one endpoint of the line
Turn grid snap on and snap to a location
There are other methods for creating precise lines. A highly efficient technique is to offset a line from an existing line, and then trim or extend it to the desired length.
Use polyline objects instead of line objects if you want the segments to be connected as a single object.

To draw lines
On the Draw menu, click Line.
Specify the start point.
You can use the pointing device or enter coordinate values on the command line.
Complete the first line segment by specifying the endpoint.
To undo the previous line segment during the LINE command, enter u or click Undo on the toolbar.
Specify the endpoints of any additional line segments.
Press ENTER to end or c to close a series of line segments.
To start a new line at the endpoint of the last line drawn, start the LINE command again and press ENTER at the Specify Start Point prompt.
(fr.autocad.help)

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