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∠A.=∠C. AD=CB BE=DF AD∥BC
AB∥CD,AD=BC AB=AD,CB=CD AB=CD,AD=BC ∠B=∠C,∠A=∠D
∠3=∠4 ∠A.+∠ADC=180° ∠1=∠2 ∠A.=∠5
∠3=∠4 ∠A.+∠ADC=180° ∠1=∠2 ∠A.=∠5
AB∥CD,AD=BC ∠A.=∠B.,∠ =∠ C.AB=CD,AD=BCD.AB=AD,CB=CD
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
∠A.=∠ ,∠ =∠DB.AB=AD,CB=CDC.AB=CD,AD=BC AB∥CD,AD=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
∠ =∠CB.∠AEB=∠ADC AE=AD BE=DC
AB∥CD,AD=BC ∠B=∠C,∠A=∠D AB=AD,CB=CD AB=CD,AD=BC
∠1=∠3 ∠2=∠3 ∠4=∠5 ∠2+∠4=180°
∠DAC=∠BCA ∠DCB+∠ABC=180° ∠ABD=∠BDC ∠BAC=∠ACD
AB//CD,AD=BC ∠A.=∠B.,∠ =∠ C.AB=AD,CB=CDD.AB=CD,AD=BC
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