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③→②→①→④ ③→④→①→② ①→②→④→③ ①→④→③→②
当AC=BD时,四边形ABCD是矩形 当AB=AD,CB=CD时,四边形ABCD是菱形 当AB=AD=BC时,四边形ABCD是菱形 当AC=BD,AD=AB时,四边形ABCD是正方形
AB∥DC,AD=BC AB∥DC,AD∥BC AB=DC,AD=BC OA=OC,OB=OD
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
AB∥DC,AD=BC AD∥BC,AB∥DC AB=DC,AD=BC OA=OC,OB=OD
AD=BC,AB∥CD AO=CO,AD=BC AD∥BC,∠ADC=∠ABC AD=BC,∠ABD=∠CDB
AB∥DC,AD∥BC AB=DC,AD=BC AO=CO,BO=DO AB∥DC,AD=BC
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
AB∥DC,AD∥BC AB=DC,AD=BC AO=CO,BO=DO AB∥DC,AD=BC
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
)当AB=BC时,四边形ABCD是矩形; ( )当AC⊥BD时,四边形ABCD是矩形; ( )当OA=OB时,四边形ABCD是矩形; ( )当∠ABD=∠CBD时,四边形ABCD是矩形.
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
四边形ABCD是梯形 四边形ABCD是菱形 对角线AC=BD AD=BC