Three consecutive vertices of a parallelogram ABCD are A (3, 0) ; B (5, 2) ,C (- 2, 6). Find the fourth vertex D.

Answer 1

CD will be parallel to AB, and of the same length.

B-A = (2,2)

So, D = C+(2,2) = (0,8)
or C-(2,2) = (-4,4)