Use Stokes' theorem to evaluate the line integral ∫_C F·dr = ∬_S curl F · dS, where F(x, y, z) = ⟨-y², x, z²⟩ and C is the curve of intersection of the plane y + z = 2 and the cylinder x² + y² = 1, oriented counterclockwise when viewed from above. Answer: ∬_S curl F · dS = π