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AB∥DC,AD∥BC AB=DC,AD=BC .AO=CO,BO=DO AB∥DC,AD=BC
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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.
平行四边形 矩形 菱形 正方形
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC