Regions are 2D enclosed areas with physical properties such as centroids or centers of mass.

 .  Find
.  Find These objects must each form an enclosed area, such as a circle or a closed polyline.
A message at the Command prompt indicates how many loops were detected and how many regions were created.

 .  Find
.  Find This point is known as the internal point.
You can make a new boundary set to limit the objects used to determine the boundary.