to 13. The coordinates for a rhombus are given as (2a, 0), (0, 2b), (-2a, 0), and (0, -2b). Write a plan prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas. (-a, b) (-2a, 0) (0, 2b) (a, b) (2a, 0) (-a,-b) (a,-b) (0.-2b)