Detailed Drawings > Annotating the Drawing > Dimensioning the Model > Inserting Dimensions > To Insert a Dimension for an Arc
  
To Insert a Dimension for an Arc
1. Click Annotate > Insert > Dimension. The Select Reference dialog box opens.
2. Select on entity, or tangent point reference option on the Select Reference dialog box.
3. Select an arc. The ghost image of the dimension appears with the radius format.
4. Right-click and select Diameter, Angular, or Arc Length as the type of the dimension for the arc.