Radial Dimension
The DimRadius command dimensions the radius of an arc or circle.
Dimensions always measure as though the object were projected to the current construction plane.
Insert a radial dimension
Steps:
- Start the command.
- Select a curve.
- Pick the dimension location.

To override dimension properties
Dimensions apply settings from annotation styles. If you need a dimension to look different than its annotation style, you can override settings in the dimension properties.
- Select the dimension, and in the Properties panel, click the Dimension button to edit dimension properties.
- Or, Double-click the dimension to open the Edit Dimension dialog box.
Note The settings different from the annotation style will be highlighted in blue.
Command-line options
AnnotationStyle
Select the annotation style name.
PointOnCurve
Pick a point on the curve where the dimension arrow will start.