I'm given 4 points and asked to find the area of the parallelogram.

K(1,2,3) , L(1,3,6), M(3,8,6), and N(3,7,3)

I want to use the cross product to do this. Don't I just have to take the cross product of KN and KL? I did this and got an answer of 11 cubic units which is not the answer. It's 16.28 and I'm not seeing what I did wrong =/