You can specify a horizontal dimension between two entities. The horizontal direction is defined by the orientation of the current sketch.
To specify a horizontal dimension:
-
In an open sketch, click Horizontal Dimension
(Dimensions/Relations toolbar) or .
The pointer changes to

.
-
Select the two entities to dimension.
You can undo previous selections by pressing
Esc. For example, when dimensioning multiple entities using the
Horizontal Dimension 
tool, you can press
Esc to undo the last selection. This is helpful if you accidentally select an entity that you did not want to dimension.
- Set the value in the Modify box and click
.
- Click a location to place the dimension.