Answer :
∠AOE, ∠DOB and ∠ EOD forms a linear pair
∠AOE = 30°
∠DOB = 40°
∠ EOD = 1800-∠AOE- ∠DOB
⇒ ∠ EOD = 1100
∠COF = ∠ EOD = 1100( Vertically Opposite)
∠COF = 1100
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