探討兩線垂直時的斜率關係。
English version: http://www.geogebratube.org/material/show/id/3449
柯志明
香港 GeoGebra 學院    
    
    
        
    
    
    
        
        
                    
         
        
        
            
                - Target Group (Age)
- 15 – 18                
- Language
- English (United Kingdom)
 
         
        
         
        
                 
    
     
    
    
 
             
         
    
    
    
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