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∠B+∠C=180° ∠B+∠D=180° ∠A+∠B=180° ∠A+∠D=180°
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;
∠A+∠C=180° ∠B+∠D=180° ∠A+∠B=180° ∠A+∠D=180°
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
∠A+∠C=180° ∠B+∠D=180° ∠A+∠B=180° ∠A+∠D=180°
∠A+∠C=180° ∠B+∠D=180° ∠A+∠B =180° ∠A+∠D=180°
∠A+∠C=180° ∠B+∠D=180° ∠B+∠A=180° ∠A+∠D=180°
∠A.+∠C.﹦180° ∠B.+∠D.﹦180° ∠A.+∠B.﹦180° ∠A.+∠D.﹦180°
∠A+∠C=180° ∠B+∠D=180° ∠A+∠B=180° ∠A+∠D=180°
∠A+∠C=180° ∠B+∠D=180° ∠A+∠B=180° ∠A+∠D=180°
∠D=60° ∠A=120° ∠C+∠D=180° ∠C+∠A=180°
∠A+∠C=180° ∠B+∠D=180° ∠A+∠D=180° ∠A+∠B=180°
∠A+∠C=180° ∠B+∠D=180° ∠A+∠B=180° ∠A+∠D=180°
∠A.+∠C.=180° ∠B.+∠D.=180° ∠A.+∠B.=180° ∠A.+∠D.=180°
∠A.+∠C.=180° ∠B.+∠D.=180° ∠A.+∠B.=180° ∠A.+∠D.=180°