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∠A.=∠C. AD=CB BE=DF AD∥BC
CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B.=∠D.=90° 
CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B.=∠D.=90°
BC=EF ∠A.=∠D AC∥DF AC=DF 
AC=AD BC=BD ∠C.=∠D ∠ABC=∠ABD 
AC=AD BC=BD ∠C.=∠D ∠ABC=∠ABD 
CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B=∠D=90°
CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B=∠D=90° 
∠ =∠CB.∠AEB=∠ADC AE=AD BE=DC 
BC＝AC CF⊥BF BD＝DF AC＝BF 
∠ =∠ B.AD=AE C.∠BDC=∠CEB BD=CE
AC=BD ∠CAB=∠DBA ∠C.=∠ D.BC=AD
AB＝BC AC⊥BD ∠ABC＝90° ∠1＝∠2 
AC=BD ∠CAB=∠DBA ∠C.=∠ D.BC=AD
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