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AB=CD,AD=BC AB=CD,AB∥CD AB=CD,AD∥BC AB∥CD,AD∥BC
AB∥CD,AD=BC ∠A.=∠ ,∠B.=∠DC.AB∥CD,AD∥BC AB=CD,AD=BC
AB∥CD,AD=BC ∠A.=∠ ,∠B.=∠D C.AB∥CD,AD∥BC AB=CD,AD=BC
AB∥CD,AD = BC; ∠B. = ∠ ;∠A. = ∠ , C.AB =CD,CB = AD;D.AB = AD,CD = BC
∠3=∠4 ∠A.=∠DCE ∠ =∠DCED.∠D.+∠ACD=180°
∠ACD=∠DAB AD=DE AD·AB=CD·BD AD2=BD·CD
AB∥CD,AD=BC ∠B=∠C;∠A=∠D AB=AD,CB=CD AB=CD,AD=BC
) ∠2 =∠3 ( ) ∠1 =∠2 ( ) ∠4 =∠5 ( ) ∠3 =∠4
∠3=∠4 ∠D.=∠DCE ∠1=∠2 ∠D.+∠ACD=180°
AB=CD AD∥BC AB∥CD AB=CD AB=CD AD=BC AB∥CD AD∥BC
∠3=∠4 ∠1=∠2 ∠D=∠DCE ∠D+∠ACD=180°
∠3=∠4 ∠1=∠2 ∠ =∠DCED.∠D.+∠ACD=180°
∠3=∠4 ∠D.=∠DCE ∠1=∠2 ∠D.+∠ACD=180°
AB=CD,AD∥BC AB∥CD,AB=CD AB=CD,AD=BC AB∥CD,AD∥BC
∠3=∠4 ∠D.=∠D.CE ∠1=∠2 ∠D.+∠ACD=180°
∠HEG =∠EGF ∠EHF +∠CFH =180° ∠AEG =∠DGE ∠EHF =∠CFH
∠3=∠4 ∠D.=∠DCE ∠1=∠2 ∠D.+∠ACD=180°
AB∥CD,AD∥BC AB=CD,AD=BC AB∥CD,AD=BC AB∥CD,AB=CD
∠A.=∠C.,∠ =∠DB.AB∥CD,AB=CD AB=CD,AD∥BC AB∥CD,AD∥BC