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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