(i) The diagonals are AC, and BD.
(ii) AB and CD, and AD and BC are the two pairs of opposite sides.
(iii) ∠A and ∠C, and ∠B and ∠D are the two pairs of opposite angles.
(iv) AB and BC, and AD and DC are the two pairs of adjacent sides.
(v) ā∠A and ∠B, and ∠C and ∠D are the two pairs of adjacent angles.