A linear dimension is a horizontal or vertical dimension with extension lines going vertically (for a horizontal linear dimension) or horizontally (for a vertical linear dimension) to the origins of the extension lines, which define the endpoint of the dimension.
This tool is ideal for creating interior dimensions, or dimensions on a landscape plan.
To create linear dimensions:
Select Tools
> Dimensions > Linear Dimensions, or click the Linear Dimensions
button on the Notation toolbar.
Click a point in your drawing to begin the dimension line.
Move your mouse (you do not have to hold the mouse button down) to a second point and click. A dimension line including offsets, arrows and a numerical value is added to your drawing.
Move your mouse away from the dimension line to stretch your extension lines. When the extension lines are the desired length, click to finish the dimension.