 Command entry:
Command entry:Main toolbar 


 (Circular Selection Region), on the Selection Region flyout
            
 Command entry:
Command entry:Edit menu 

 Selection Region 

 Circular Region
            
 Selects objects within a circular area.
         You can use Circular to select either objects that are completely within the selection region (window method), or objects
            that are either within or touched by the selection shape (crossing method). Toggle between the window and crossing selection
            methods by using the Window/Crossing toggle on the main toolbar.
         
         NoteIf you hold down Ctrl while specifying a region, the affected objects are added to the current selection. Conversely, if you hold down Alt while specifying a region, the affected objects are removed from the current selection. 
            
         
            
            Procedures
            
            
            To select using a circle:
            
            
               - Click  (Circular Selection Region). (Circular Selection Region).
- Drag in a viewport, then release the mouse. The first location you click is the center of the circle, where you release the
                  mouse defines the circle's radius.
                  To cancel the selection, right-click before you release the mouse.