A student states, "If in a quadrilateral one pair of opposite sides is equal and parallel, the quadrilateral must be a parallelogram."
(i) Draw a labelled sketch of a quadrilateral ABCD in which AB=CD and AB∥CD.
(ii) Give a logical explanation to justify the student’s statement.
(iii) Name any two other independent conditions (without proof) under which a quadrilateral can be confirmed to be a parallelogram.