Sketcher > Dimensioning Sketcher Geometry > Working with Dimension Tools > Normal Dimensions > To Create Radial Dimensions
  
To Create Radial Dimensions
Radial dimensions measure the radii of circles or arcs and circles and arcs created by revolving a section about an axis.
To Create a Radial Dimension for an Arc or Circle
1. Do one of the following operations:
Right-click in the Sketcher window and choose Dimension from the shortcut menu or click Sketch > Normal.
2. Select the circle or arc.
3. Middle-click to place the dimension. The dimension is created.
To Create a Radial Dimension for a Revolved Section
1. Right-click in the Sketcher window and choose Dimension from the shortcut menu or click Sketch > Normal.
2. Select the entity.
3. Select the centerline axis.
4. Click the middle mouse button to place the dimension. A linear dimension is created.
5. Select the dimension and right-click and choose Convert to Radius. The dimension is converted.