Constrain circles and arcs concentrically. If a circle or arc is moved, the other constrained circle or arc moves so that their centers remain aligned. The circles or arcs do not need to be concentric when you place the constraint; the first object moves so that its center aligns to the second object’s center.
To constrain two circles or arcs concentrically:
Click the Constrain Concentric tool from the Dims/Notes tool set.
Click the object to constrain.
The cursor switches to the bull’s-eye cursor.
Click the object to be constrained.
A green concentric constraint is drawn at the center of the two objects.
