ClickDimension
menu Diameter.At the Command prompt, enter
dimdiameter.
Select the arc or circle to dimension.
Enter options as needed:
To edit the dimension text content, enter t (Text) or m (multiline
text). Editing within or overwriting the brackets (<>)
changes or removes the dimension value. Adding text before or after
the brackets appends text before or after the dimension value.
To change the dimension text angle, enter a (Angle).