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若AB∥CD,AB=CD,则四边形ABCD是平行四边形; 若AC⊥BD,AC=BD,则四边形ABCD是矩形; 若AC⊥BD,AB=AD,CB=CD则四边形ABCD是菱形; 若AB=BC=CD=AD,则四边形ABCD是正方形;
若AB∥CD,AB=CD,则四边形ABCD是平行四边形 若AC⊥BD,AC=BD,则四边形ABCD是矩形 若AC⊥BD,AB=AD,CB=CD则四边形ABCD是菱形 若AB=BC=CD=AD,则四边形ABCD是正方形
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
AB=CD AD//BC AD=BC ∠A.=∠C.
)AB=AD,BC=CD ( )∠A.=∠ ,∠B.=∠ (C.)AB∥CD,AB=CD (D.)AB=CD,AD=BC
AB=CD,AD=BC AB∥CD,AB=CD AB=CD ,AD∥BC AB∥CD,AD∥BC
AB=CD,AD∥BC AB=CD,AB∥CD AB∥CD,AD∥BC AB=CD,AD=BC
当AB=CD,AO=DO时,四边形ABCD为矩形 当AB=AD,AO=CO时,四边形ABCD为菱形 当AD∥BC,AC=BD时,四边形ABCD为正方形 当AB≠CD,AC=BD时,四边形ABCD为等腰梯形
AB=CD,AD∥BC AB=CD,AB∥CD AB∥CD,AD∥BC AB=CD,AD=BC
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
AB=BC,AD=CD AB=CD,AD∥BC ∠A=∠B,∠C=∠D AB∥CD,∠A=∠C
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
AB∥CD,AD∥BC OA=OC,OB=OD AD=BC,AB∥CD AB=CD,AD=BC
AB∥CD,AB=CD ∠A.=∠ ,∠B.=∠ C.AB=AD,BC=CD D.AB=CD,AD=BC