Entity toolbar : 





The Dimension Tool is responsible for creating Dimension Entities.
Find one of the Dimension Line Tool icons 




from the Entity Toolbar (color coded blue) and highlight it. While highlighted Click on the tool. The tool is now the active tool and ready for use. This set of tools is part of a Flyout toolbar.
There are six different types of Dimension Line tools available to create various types of Dimension Lines.
1. Aligned Dimension Tool (default) | : A Linear dimension for objects with unusual shapes, or with edges at unusual angles; the dimension line will always parallel the imaginary line connecting the origins of the extension lines. |
2.
Linear Dimension Tool : Linear dimension that will either be oriented along either the X-axis or the Y-axis (your choice).
3.
Ordinate Dimension Tool : Dimension of an X-axis or Y-axis point. (your choice)
4.
Radial Dimension Tool : Dimension for the radius of a circle.
5.
Diametric Dimension Tool : Dimension for the diameter of a circle.
6.
Angular Dimension Tool : Dimension for an angle (in radians or degrees).
Also See:
Dimension Entity
Manage Dimension Styles
Flyout Toolbar