Martin wants to use coordinate geometry to prove that the opposite sides of
a rectangle are congruent. He places parallelogram ABCD in the coordinate
plane so that A is (0.0). B is (a,0). C is (a, b), and D is (0, b).
What formula can he use to determine the distance from point D to point A?
A 10-12 +(0-09 =B=0
B. -2) = (-0? = VB =D
C. 0-0j? =(3-03 = 8
D. (2-2)2+(0-0)2 = 8