Given below is a parallelogram ABCD. Complete each statement along with the definition or property used.

(i) AD = (ii) ∠DCB=

(iii) OC = (iv) ∠DAB+ ∠CDA =

(i) AD = BC [In a parallelogram diagonals bisect each other]

(ii) ∠DCB = ∠BAD [alternate interior angles are equal]

(iii) OC = OA [In a parallelogram diagonals bisect each other]

(iv) ∠DAB+ ∠CDA = 180° [Sum of adjacent angles in a parallelogram is 180°]