1. The problem statement, all variables and given/known data Use Cartesian vectors in two-space to prove that the line segments joining midpoints of the consecutive sides of a quadrilateral form a parallelogram. 2. Relevant equations We could say vectors a and b a = [a1, a2] b = [b1, b2] 3. The attempt at a solution Am really confused by this question..I would really appreciate it if anyone could offer tips to help me get started on this problem. Thanks!