You can add a dimension where both ends are on the same arc, such as in the case of radii and holes where it is necessary to dimension both quadrants or the center and a quadrant.
To dimension two points of the same arc:
-
Click Smart Dimension
(Dimensions/Relations toolbar) or .
- Shift + select the first quadrant of the arc and select the center or the second quadrant.
You do not need to hold down the Shift key once you select a quadrant of an arc to start a dimension.