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CB=CD ∠BAC=∠DAC ∠BCA=∠DCA ∠B.=∠D.=90°
＝90°；②AC⊥BD，AC＝BD；③OA＝OD，BC＝CD；④∠BOC＝90°，∠ABD＝∠DCA. A.1个 2个 3个 4个 
∠D.=∠C，∠BAD=∠ABC ∠BAD=∠ABC，∠ABD=∠BAC BD=AC，∠BAD=∠ABC AD=BC，BD=AC
∠C=∠D AC=AD ∠CBA=∠DBA BC=BD
∠D.=∠C BD=AC ∠CAD=∠DBC AD=BC
AC=AD BC=BD ∠C.=∠D ∠ABC=∠ABD 
AC=AD BC=BD ∠C.=∠D ∠ABC=∠ABD 
∠D.=∠C BD=AC ∠CAD=∠DBC AD=BC
∠C=∠D ∠ABC=∠ABD AC=AD AB=AB
∠BAD=∠C ∠ADB=∠BAC AB2=BD•BC 
=
∠1=∠2 ∠ABD=∠BDC ∠3=∠4 ∠BAD+∠ABC=180°
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC
AC=BD ∠DAB=∠CBA ∠C=∠D BC=AD
∠ABD＝∠ACB ∠ADB＝∠ABC AB2＝AD·AC 
＝
∠D.＝∠C.，∠BAD＝∠ABC ∠BAD＝∠ABC，∠ABD＝∠BAC BD＝AC，∠BAD＝∠ABC AD＝BC，BD＝AC 
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