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∠1=∠2 ∠3=∠4 ∠1+∠3=180° ∠3+∠4=180 °
∠2=75° ∠4=75° ∠3=105° ∠5=75°
AB∥CD,AD = BC; ∠B. = ∠ ;∠A. = ∠ , C.AB =CD,CB = AD;D.AB = AD,CD = BC
∠1=∠2 ∠1=∠3 ∠1+∠4=180° ∠2+∠4=180°
AB∥CD,AD=BC ∠B=∠C;∠A=∠D AB=AD,CB=CD AB=CD,AD=BC
∠1=∠2 ∠3=∠4 ∠1+∠3=180° ∠3+∠4=180 °
∠3=∠4 ∠D.=∠DCE ∠1=∠2 ∠D.+∠ACD=180°
∠3=∠4 ∠1=∠2 ∠D=∠DCE ∠D+∠ACD=180°
∠3=∠4 ∠1=∠2 ∠ =∠DCED.∠D.+∠ACD=180°
∠1=∠2 ∠3=∠4 ∠1+∠4=180° ∠3+∠4=90°
∠HEG =∠EGF ∠EHF +∠CFH =180° ∠AEG =∠DGE ∠EHF =∠CFH
∠3=∠4 ∠D.=∠DCE ∠1=∠2 ∠D.+∠ACD=180°
AB//CD,AD=BC ∠A.=∠B.,∠ =∠ C.AB=AD,CB=CDD.AB=CD,AD=BC
∠1=∠2 ∠3=∠4 ∠1+∠3=180° ∠3+∠4=180 °