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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
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