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1、先折出一個正方形 2、將正方形對折【邊對邊】折成的1/2正方形(即長方形)各點為ABCD,AB為長邊. 根據是直角三角形中,如果一直角邊等於斜邊的一半,那麼這條這叫邊所隊的角為30度) 4.所以再把30度角的臨補角對折,所以一個角即為75度(180-30=150150/2=75)
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