Vectors Rectangle Problem

[Calc12]

A) Graph the 2 quadrilaterals with their respective vertices
B) Using vectors, show that only one of the quadrilaterals is a rectangle

Quadrilateral ABCD: A(-4,2), B(5,5), C(6,2), D(-3,-1)

Quadrilateral WXYZ: W(-3,5), X(9,1), Y(7,-6), Z(-5,-2)

I have graphed them, and to me they BOTH look like rectangles..
So I don't know how to do partB?

Thanks in advance

 

[pka]

A) Graph the 2 quadrilaterals with their respective vertices
B) Using vectors, show that only one of the quadrilaterals is a rectangle
Quadrilateral ABCD: A(-4,2), B(5,5), C(6,2), D(-3,-1)
Quadrilateral WXYZ: W(-3,5), X(9,1), Y(7,-6), Z(-5,-2)

Is it true that \(\displaystyle \overrightarrow {WX} \bot \overrightarrow {XY} ~?\)