Class : Class 7 
                                                                                                        
                                                                                                        Every wall does not have a window.So, the diagram should be one big circle within which two intersecting circles are there.
                                                                                                    
                                                                                                     
             
             
         
                                                                         
 
 
  
 
 
 
 
 
  
 
 
