We want to find the value of x for which the given figure is a rectangle.
There is a theorem that tells us that the diagonals of a parallelogram are congruent. There is another theorem that tells us that the diagonals of a parallelogram bisect each other. Therefore, the halves of the diagonals must be congruent. This means that their lengths must be equal.
2x-1 = x+3
Let's solve this equation to find x.
