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∠D=∠C BD=AC ∠CAD=∠DBC AD=BC
∠D.=∠C BD=AC ∠CAD=∠DBC AD=BC
BC=AD,∠ABC=∠BAD BC=AD,AC=BD
AC=BD,∠CAB=∠DBA BC=AD,∠CAB=∠DBA
AB2=BC·BD AB2=AC·BD AB·AD=BD·BC AB·AD=AD·CD
BC=BD ∠ACB=∠ADB AC=AD ∠CAB=∠DAB
BC=BD. ∠ACB=∠ADB. AC=A D. ∠CAB=∠DAB
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
AC=BD ∠CAB=∠DBA ∠C.=∠ D.BC=AD
∠CAD=30° AD=BD BD=2CD CD=ED
△ABC≌△BAD ∠CAB=∠DBA OB=OC ∠C=∠D
AC=BD ∠CAB=∠DBA ∠C.=∠ D.BC=AD