Question

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

Answer 1

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.