12. ACT/SAT Quadrilateral ABCD has vertices A(0,1), B(1,4), C(5,5), and D(4,2). Kalina uses the slope
formula to show that BC is parallel to AD. Which
of the following can she use as her next step to
show that ABCD is a parallelogram?
1. Use the Slope Formula to show
that AB is parallel to CD.
II. Use the Distance Formula to
show that BC is congruent to AD.
III. Use the Distance Formula to
show that AB is congruent to CD.