If a(−2, 1), b(1, 5), c(4, 4), and d(1, 0) are the vertices of a quadrilateral, do the points form a parallelogram? justify your answer. yes, it is a parallelogram because the slope of segment ab equals the slope of segment dc, which equals negative start fraction four over three end fraction, and ad = bc = 10 units. yes, it is a parallelogram because the midpoint of the diagonals segment ac and segment bd is (4.5, 2.5). no, it is not a parallelogram because the slope of segment ab = 1 and the slope of segment dc equals negative start fraction four over three end fraction full stop yes, it is a parallelogram because the slope of segment ab equals the slope of segment dc, which equals start fraction four over three end fraction, and ab = dc = 5 units.