In quadrilateral mnop,
i. trapezoid ii. rhombus iii. parallelogram

1)
ii and iii

2)
i and ii

3)
iii only

4)
i, ii, or iii

5)
i only

4) Since we've established before that a square can be a rhombus or a parallelogram, the criteria that two adjacent angles must be equal holds for both. This shape can be a trapezoid in the special case where one pair of sides is congruent and parallel and the other is congruent but creates a shape such that opposite angles are supplementary and adjacent angles are congruent.