#### 4.1.1.5. Geometry and Units

A shell geometry is required for building any composite model in ACP. The geometry can either be constructed in the ANSYS Design Modeler or imported as a CAD file.

The ACP unit system is independent from the unit system in the Mechanical application (User Interface or Solver). The transfer from the Mechanical application to ACP and vice versa automatically converts the data. The current unit system is displayed in the status bar of ACP at the bottom of the screen.

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