Answer:
(i) AD = BC | Opposite sides are equal (ii) \[\angle DCB=\angle DAB\] | Opposite angles are equal (iii) OC = OA |\[\because \] Diagonals bisect each other (iv) \[m\angle DAB+m\angle CDA={{180}^{\text{o}}}\] | Interior opposite angles, since \[\overline{AB}||\overline{DC}\].
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