Dear student, Draw a line OP parallel to CD thus it will also be parallel to AB∠AOP=∠BAO=35∘ [Alternate Angle]∠POC=∠OCD=50∘[Alternate Angle]∠AOC=∠AOP+∠POC=35∘+50∘=80∘regards

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D r a w a l i n e O P p a r a l l e l t o C D t h u s i t w i l l a l s o b e p a r a l l e l t o A B ∠ A O P = ∠ B A O = 35^{\circ} [A l t e r n a t e A n g l e] ∠ P O C = ∠ O C D = 50^{\circ} [A l t e r n a t e A n g l e] ∠ A O C = ∠ A O P + ∠ P O C = 35^{\circ} + 50^{\circ} = 80^{\circ} r e g a r d s

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