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              The figure shows circles A (radius r) 
				and B (radius r) tangent at point C. A common tangent line is 
				tangent to the circles at points D and E, respectively. Points F 
				and G are on line segment DE, point M is on arc CD, and point H 
				is on arc CE. If FGHM is a square of side length x, prove the 
				following conclusion 				 . 
				 
				
                  
							
				  
  
				References: Fukagawa Hidetoshi, Tony Rothman, "Sacred 
				Mathematics: Japanese Temple Geometry" (Princenton 
				University Press, 2008). 
				
							  
        
  
  
      
  
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