Calculate the surface area of the plane z=2x+2yz = 2x + 2yz=2x+2y over the unit circle x2+y2≤1x^2 + y^2 \leq 1x2+y2≤1.
3π3\pi3π
π3\pi\sqrt{3}π3
2π2\pi2π
π9\pi\sqrt{9}π9