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∠EDC=∠EFC ∠AFE=∠ACD ∠1=∠2 ∠3=∠4 
∠C.=∠ABE ∠A.=∠EBD ∠C.=∠ABC ∠A.=∠ABE
∠C=∠ABE ∠A=∠EBD ∠C=∠ABC ∠A=∠ABE
＝90°；②AC⊥BD，AC＝BD；③OA＝OD，BC＝CD；④∠BOC＝90°，∠ABD＝∠DCA. A.1个 2个 3个 4个 
∠C.=∠ABE ∠A.=∠EBD ∠C.=∠ABC ∠A.=∠ABE 
∠C.=∠ABE ∠A.=∠EBD ∠C.=∠ABC ∠A.=∠ABE 
∠C=∠ABE ∠A=∠EBD ∠C=∠ABC ∠A=∠ABE
AC=AC ∠BAC=∠DAC ∠BCA=∠DCA ∠B=∠D
∠C=∠ABE ∠A=∠EBD ∠C=∠ABC ∠A=∠ABE
BA=BC AC、BD互相平分 AC=BD AB∥CD
∠C.＝∠ABE ∠A.＝∠EBD ∠C.＝∠ABC ∠A.＝∠ABE
∠EDC=∠EFC ∠AFE=∠ACD ∠3=∠4 ∠1=∠2
∠C=∠ABE ∠A=∠EBD ∠C=∠ABC ∠A=∠ABE
∠EDC=∠EFC ∠AFE=∠ACD ∠3=∠4 ∠1=∠2
∠C.=∠ABE ∠A.=∠EBD ∠C.=∠ABC ∠A.=∠ABE
∠EDC=∠EFC ∠AFE=∠ACD ∠3=∠4 ∠1=∠2
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