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AC=A′C′ BC=B′C′ ∠B=∠B′ ∠C=∠C′
CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B.=∠D.=90°
∠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°
AC=AD BC=BD ∠C=∠D ∠ABC=∠ABD
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=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B=∠D=90°
CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B.=∠D.=90°
CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B=∠D=90°
AC=BD ∠CAB=∠DBA ∠C.=∠ D.BC=AD
AC=AD BC=BD ∠C=∠D ∠ABC=∠ABD
CB=CD ∠BCA=∠DCA ∠BAC=∠DAC ∠B.=∠D.=90°
AB=BC AC⊥BD ∠ABC=90° ∠1=∠2
AC=BD ∠CAB=∠DBA ∠C.=∠ D.BC=AD