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## 三角形角的定理

- 三角形的內角和等于180度
- 三角形外角和內角等于180度
- 三角形不相鄰的兩個內角和等于外角
- 三角形的外角等于與它不相鄰的兩個內角的和
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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