Diameter Dimensions

1. Click Annotate tabDimension panel (Diameter).
2. Place the cursor on the curve of a circle or arc, and click.

   A temporary dimension displays.

   Tip: You can switch the reference point for the dimension between a wall face and a wall centerline by pressing Tab.
3. Move the cursor along the dimension line, and click to place the permanent dimension.
   

   By default, a diameter prefix symbol displays in the dimension value. To control the prefix display, see Permanent Dimension Type Properties.