Answer :

Given ABCD is a Parallelogram so ∠ABC = ∠ADC (opposite angles of Parallelogram are equal)

⇒ ∠ABC = ∠ADC = 60°

Also, BC ∥ AD and AB is transversal

⇒ ∠ABC + ∠DAB = 180° (angles on the same side of transversal)

⇒ ∠DAB = 180° - 60° = 120°

⇒ ∠DCB = 120° (opposite angles of Parallelogram are equal)

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