I don't know if it could be the area of a square but x has to be 8.34. (ROUNDED)
I'm not really sure on this one, but I'd say it's B.
The tangent of an angle is the trigonometric ratio between the adjacent side and the opposite side of a right triangle containing that angle. Example: In the triangle shown, tan(A)=68 or 34 and tan(B)=86 or 43 .