Toolbar :

Part-Editor : Constraints toolbar

Menu :

Part-Editor : Add menu > Geometry sub-menu> > Constraints sub-menu > Add Concentric

To add :

Click Add Concentric Constraint, then:

•Two Circles

- or -

•Two Arcs

- or -

•An Arc and a Circle

Result :

•Two Circles become concentric

- or -

•Two Arcs become concentric

- or -

•The Arc and Circle become concentric

To Delete :

1.SHIFT+CLICK a sketch-element with a Concentric Constraint

The sketch-element and Concentric Constraint show in the Selection-Window.

2.Right-click the Concentric Constraint element in the Selection-Window

3.Click Delete in the contextual-menu