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你應該提供一下圖片的,我隨意做了一個,你做一下參攷吧: 假設圖示所示:角1=66度,因為角2和左邊的角(沒標識的那個角)相等,具體你可以用長方形的紙折一下;  ; ; ;這樣:2倍的角2+角1=180度,角2=57度
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