1.Given a parallelogram ABCD. Complete each statement along with the definition or property used.
(i) AD = …………

(ii) ∠DCB = ………

(iii) OC = ………

(iv) m?DAB + m∠CDA = ……..

(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.