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                            ## 4.2平面
### 4.2.1矩形
啟動矩形命令后，通過鼠標點擊或者按下tab鍵打開追蹤器輸入的方式指定第一點和對角線上的第二點，快速繪制出矩形。按下shift鍵，可以切換不同的平面展開方向。處于xy平面時，動態繪制呈現藍色；處于xz平面時，動態繪制呈現綠色；處于yz平面時，動態繪制呈現紅色。如圖4.2-1。繪制完成并選中圖形，可以使用屬性面板或者夾點對圖形進行修改。

:-: ![](https://img.kancloud.cn/3c/39/3c39f6ae2b165f5c4182615f2345c619_219x140.png)
![](https://img.kancloud.cn/ec/fb/ecfbe6a586989fe77d17494a8d7bc70a_196x127.png)
![](https://img.kancloud.cn/ca/98/ca984001c636a94fa3754c0d5c6242e9_300x200.png)

:-: 圖 4.2-1
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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