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Answer :
(i) AD = BC as the opposite sides of a parallelogram are equal.
(ii)∠DCB = ∠DAB as the opposite angles of a parallelogram are equal.
(iii) OC = OA as the diagonals of a parallelogram bisect each other.
(iv) m∠DAB + m∠CDA = \(180^{\circ}\) as the adjacent angles of a parallelogram are supplementary.