Linear Dimension

The Linear Dimension tool measures the distance between two points and places a dimension line annotated with that distance.

Creating a linear dimension

Select the Linear Dimension tool.
Pick the first dimension point. Hold Ctrl to pick an aligned reference line, or Shift to pick a perpendicular reference line.
Pick the second dimension point. Hold Shift to set the dimension angle.
Move the mouse to position the dimension line, then click to place it.

The Text, Tolerance, and Angle input boxes let you override the dimension text, add a tolerance, and set the angle of the dimension line. See the section overview for the options shared by all dimension tools.