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∠2=∠1,∠ =∠D.B.AB=AD,∠3=∠4 ∠2=∠1,∠3=∠4 AB=AD,∠2=∠1
∠EDC=∠EFC ∠AFE=∠ACD ∠1=∠2 ∠3=∠4 
(1)(3) (2)(4) (1)(3)(4) (1)(2)(3)(4)
＝90°；②AC⊥BD，AC＝BD；③OA＝OD，BC＝CD；④∠BOC＝90°，∠ABD＝∠DCA. A.1个 2个 3个 4个 
∠1=∠2 ∠1=∠3 ∠1+∠4=180° ∠2+∠4=180°
∠1=∠2 ∠ABD=∠BDC ∠3=∠4 ∠BAD+∠ABC=180°
∠1=∠3 ∠2= ∠3 ∠1=∠2 ∠1=∠2=∠3.
∠1=∠3 ∠2=∠3 ∠1=∠4 ∠3=∠4 
∠EDC=∠EFC ∠AFE=∠ACD ∠3=∠4 ∠1=∠2
∠EDC=∠EFC ∠AFE=∠ACD ∠3=∠4 ∠1=∠2
∠1=∠2 ∠ABD=∠BDC ∠3=∠4 ∠BAD+∠ABC=180°
∠A.+∠2=180° ∠A.=∠3 ∠1=∠4 ∠1=∠A.
∠EDC=∠EFC ∠AFE=∠ACD ∠3=∠4 ∠1=∠2
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