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仮定よりAD=CB・・①
仮定より∠DAF=∠BCE・・②
平行四辺形の対角はそれぞれ等しいので
∠ADF=∠CBE・・③
①②③より一つの辺とその両端の角が等しいので
三角形ADF≡三角形CBE

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