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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;
AB∥CD,AD=BC ∠A.=∠ ,∠B.=∠DC.AB∥CD,AD∥BC AB=CD,AD=BC
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 ∠A.=∠ ,∠B.=∠D C.AB∥CD,AD∥BC AB=CD,AD=BC
AB=CD,CD=DA; AB∥CD,AD=BC; AB∥CD,∠A.=∠C.; ∠A.=∠B.,∠C.=∠D.
AB∥CD,AD = BC; ∠B. = ∠ ;∠A. = ∠ , C.AB =CD,CB = AD;D.AB = AD,CD = BC
AB∥CD,AD=BC AB=AD,CB=CD AB=CD,AD=BC ∠B=∠C,∠A=∠D
AB∥CD,AD=BC ∠B=∠C;∠A=∠D AB=AD,CB=CD AB=CD,AD=BC
AB=BC,AD=CD AB=CD,AD∥BC ∠A=∠B,∠C=∠D AB∥CD,∠A=∠C