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3D CAD - Extrude Boss & Cut Introduction - Table Napkin Holder

Step 33D CAD - Table Napkin Holder - Apply Symmetric Constraint

3D CAD - Table Napkin Holder - Apply Symmetric Constraint
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First select the Constraint Flyout, then select the Symmetric Constraint

Click the Vertical Axis as the centerline, then click the left edge line of the Rectangle first, then the Right edge line of the Rectangle.

The Symmetric Constraint will directly and automatically adjust the second line selection to be symmetric with the first line selected on the left about the Vertical Axis.
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