# Symmetric Constraint

Makes two objects, or object endpoints, symmetric with respect to a symmetry axis.

- Start with three lines - one of which is the symmetry line. In some cases the symmetry line will move as a result of this constraint, so if you want it to remain in place, fix it with a constraint such as
**Fix Geometry**. - Activate the
**Symmetric**constraint and select the first line.

- Select the second line.

- Finally, select the symmetry line.

The first two lines are now symmetric with respect to the third.

- You can also use this constraint on endpoints. Select Vertices 1 and 2, then select the symmetry line.

The lines themselves keep their orientation, but their endpoints are symmetric.

- To make both lines completely symmetric, apply the
**Symmetric**constraint to the other two endpoints.

- This constraint can also be used on circles and arcs. If you select two arcs (not at their endpoints) . . .

... they will become symmetric and have equal radii.

- Like with lines, you can apply the
**Symmetry**constraint at both sets of endpoints. First the upper endpoints . . .

- . . . then the lower endpoints.

The result is that both sets of endpoints are symmetric, but the orientations of the arcs are still different, because they have different radii.

- You can make the arcs completely symmetric by adding an
**Equal Radius**constraint.

**Note:** You could get the same results if you apply three **Symmetric** constraints - one to the arcs themselves, and one for both sets of endpoints.