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                # PHP rad2deg() 函數 ## 定義和用法 rad2deg() 函數把弧度數轉換為角度數。 ### 語法 ``` rad2deg(radian_number) ``` | 參數 | 描述 | | --- | --- | | radian_number | 必需。規定要轉換的弧度。 | ### 說明 本函數將 _radian_number_ 從弧度轉換為角度。 ## 例子 ``` <?php $rad = M_PI; $deg = rad2deg($rad); echo "$rad radians is equal to $deg degrees"; ?> ``` 輸出類似: ``` 3.14159265359 radians is equal to 180 degrees ```
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