Answer:
192 
Step-by-step explanation:
We use the same area equation for a rectangle
A = b * l
A = 12 * 16
A = 192
If its less than 90, its a right triangle. Hope this helps!
I don't have my calculator handy just now. But just looking at that problem, why don't you try +20 and -45 and see if they do the job.
I think the sabers are X=2 and X=-2