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                            ### 先看下直角三角形
![](https://box.kancloud.cn/b34157d678eb2dcf997b414ef5a2cc3f_810x146.png)

### 勾股定理（直角邊平方和等于斜邊的平方）
![](https://box.kancloud.cn/da0ce402161134a28a14e2134cd32193_1053x515.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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