To dimension between the edges of two arcs:
- Click Smart Dimension
(Dimensions/Relations toolbar) or.
- Select the edge of the first arc, and then select the edge of the second arc.

- Press Shift, and then click to apply the dimension between the two edges.
- Applies a minimum dimension between the first and second arc conditions.
- Opens the Dimension PropertyManager where you can change the way the distance is measured.
