This problem is from Cutnell and Johnson Physics 8th Edition Chapter 22, Problem 12.
Two flat surfaces are exposed to a uniform, horizontal magnetic field of magnitude 0.51 T. When viewed edge-on, the first surface is tilted at an angle of 11 degrees from the horizontal, and a net magnetic flux of 0.0093 Wb passes through it. The same net magnetic flux passes through the second surface. (a) Determine the area of the first surface. (b) Find the smallest possible value for the area of the second surface.