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相等 因為DE平行於AC,DF平行於AB(已知) 所以∠EDA=∠DAF,∠ADF=∠DAE(兩直線平行,內錯角相等) 又因為AD是三角形ABC的角平分線(已知) 所以∠DAF=∠DAE(角平分線定義) 所以∠EDA=∠ADF(等量代換)
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