> ## Activating a Coordinate System

> When you set a User-Defined Coordinate System (UCS) as the active axes, operations such as measuring, transforming a model, or defining a viewpoint are applied with respect to these axes.

> 1. From the Analysis menu, select Set User Coordinate System.

> The User Coordinate Systems dialog box appears.

> 2. From the Coordinate System list, select the trihedral coordinate system that you want to use.
> 3. Click Set Active.
> 4. Click OK to close the User Coordinate Systems dialog box.

> The newly active trihedral coordinate system appears bolder and larger on the model.

> ## Deleting a User Coordinate System

> 1. From the Analysis menu, select Set User Coordinate System.

> The User Coordinate Systems dialog box appears.

> 2. From the Coordinate System list, select the trihedral coordinate system that you want to delete.
> 3. Click Delete.

> Note: The UCS disappears from the list.

> 4. Click OK to close the User Coordinate Systems dialog box.

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