Find area of quadrilateral given A(-4,-2), B(0,5), C(9,3) and D(7,-4).
Since I do not know which quadrilateral it is, I decided to graph the points given on the xy-plane.
I determined it is a parallelogram or so I think.
I found the base to be 11 and height to be 8.
So, A = bh, which is A = 11*8 or 88 but I am wrong according to the math book.
Who is right and why?