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BC=EF ∠A=∠EDF AB∥DE ∠BCA=∠F
BC=BE AC=DE ∠A=∠D ∠ACB=∠DEB
∠A=∠D ∠ACB=∠DBC AC=DB AB=DC
∠ =∠ B.AD=AE C.∠BDC=∠CEB BD=CE
∠ =∠ B.AD=AE C.∠BDC=∠CEB BD=CE
∠A.=∠D. BC=EF ∠ACB=∠F. AC=DF
∠ =∠CB.AD=AE ∠BDC=∠CEB BD=CE
∠ =∠CB.∠AEB=∠ADC AE=AD BE=DC
BC=BE AC=DE ∠A=∠D ∠ACB=∠DEB
BC=BE AC=DE ∠A.=∠ D.∠ACB=∠DEB
∠ =∠ B.AD=AE C.∠BDC=∠CEB BD=CE
∠ =∠ B.AD=AE C.∠BDC=∠CEB BD=CE
CB=CD ∠BCA=∠DCA ∠BAC=∠DAC ∠B.=∠D.=90°
AB=BC AC⊥BD ∠ABC=90° ∠1=∠2
∠AED=∠ABC AD・AB=AC・AE AD・AB=DE・AC ∠ADE=∠C
AC=BD ∠CAB=∠DBA ∠C.=∠ D.BC=AD