If we wanted to prove quadrilateral MNOP was a parallelogram, which method below would not work? 1.Doing four slope formulas to show both pairs of opposite sides are parallel.

2.Doing two midpoint formulas to show the diagonals intersect at the same point.

3.Doing two slope formulas and two distance formulas to prove the same pair of opposite sides is congruent and parallel.

4.Doing two distance formulas to show that adjacent sides are not the same length