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Click Dimensions
         
       in the Dimensioning toolbar.  
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Select both lines to be dimensioned, one after the other. 
       The angle dimension appears in the sector associated to both selected 
       lines. 
  
       
        
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Drag the angle dimension line to the desired quadrant (or 
       sector). 
  
       
       
         
           You can move the dimension to a new sector by using the 
           contextual menu:
             - Right-click the angle dimension and from the contextual menu, 
             Angle Sector, either select a given angle sector or the 
             Complementary Angle sector.
 
 
              
             - You can also CTRL-click the dimension line.
 
 
              
            
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Click anywhere to create the angle dimension. 
       
         
           
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           You can edit the angle sector of an existing angle dimension, by 
           right-clicking the angle dimension and selecting the 
           Dimension_name object > Angle Sector command from the 
           contextual menu. | 
          
        
        
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Create a rectangle.   
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Select Angle Dimensions
        
       in the Dimensioning toolbar.  
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Select two lines in the rectangle to create an angle 
       dimension. 
  
       
        
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Click to create the angle dimension, then right-click the 
       dimension and select Half Dimension.  
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Click in a free space to create the dimension. 
       
       
         
           
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           Note that the half angle dimension's orientation depends on the 
           order of selection of the lines to be dimensioned. If you had you 
           selected the vertical line first, then the horizontal one, the 
           orientation of the dimension would had been the following: 
  
           
           If you need to modify the dimension, use 
           Re-route dimension
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