I - Commands   
INVERT_ROT (command)
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Invert the sense of rotation of a region contour or of a linear element

You can invert the sense of rotaion of Region contours and closed Linear elements .
For not closed Linear elements this is the same as Moving the starting point .

 

To invert the sense of rotation:

 

   Modify toolbar 

  Menu: Modify  Regions operations... Invert sense of rotation

  Menu: Modify  Polylines operations... Invert sense of rotation

 Command line: INVERT_ROT