Given a parallelogram ABCD. Complete each statement along with

Given a parallelogram ABCD. Complete each statement along with the definition with the definiton or property used.
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(i) AD = ………
(ii) ∠DCB = …………….
(iii) OC = ……………….
(iv) m∠DAB + m∠CDA = ……………

(i) AD = BC : In a parallelogram, opposite sides are euqal.
(ii) ∠DCB = ∠DAB : In a parallelogram, opposite angles are equal.
(iii) OC = OA : The diagonals of a parallelogram bisect each other.
(iv) m∠DAB + m∠CDA = 180° : In a parallelogram, the stun of any two adjacent angles is 180°.