Add a Radius Constraint
- Select Sketch | Constraints | Add radius constraint.
- Select a circle or an arc.
- Select the position of the dimension.
- Edit the data in the Edit constraint dialog box.
- Click OK.
- Add more radius constraints by repeating steps 2-5 or finish adding radius constraints by pressing ESC or middle mouse button.
Add a radius dimension to the axis of an ellipse by selecting a line either near the main axis of the ellipse or near the second axis, depending on to which axis you want to add the radius dimension.