A =    
 
    5.    1.    0.   
  - 1.    3.    1.   
  - 2.    1.    10.  
 
 Centers are :    
 
    5.  
 
 Radius :    
 
    1.  
 
 Centers are :    
 
    3.  
 
 Radius :    
 
    2.  
 
 Centers are :    
 
    10.  
 
 Radius :    
 
    3.  
 
 The figure indicates that 2 of the eigenvalues of A lie inside the intersected region of 2 circles, and the remaining eigen value in the other circle.