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如圖,把⊿DCF繞D順時針旋轉90º;,到達⊿DAG,∵GE=GA+AE=FC+AE=EF, ;DG=DF, ;DE=DE ;∴⊿DGE≌⊿DFE(SSS), ; ;∠GDE=∠FDE,又∠GDE+∠FDE=∠GDF=90º; ;(旋轉角)∴∠EDF=…
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