If a parametric surface given by r(u, v) = f(u, v)i + g(u, v)j + h(u, v)k and -4 u 4,-1 v 1, has surface area equal to 4, what is the surface area of the parametric surface given by r2(u, v) = 2r1(u, v) with -4u 4,-1v 1? Preview My Answers Find the surface area of that part of the plane 8x +9y+z= 9 that lies inside the elliptic cylinder Surface Area = Submit Answers Preview My Answers Submit Answers Consider the surface with parametric equations r(s, t) = (st, s+t, s-t). A) Find the equation of the tangent plane at (2,3,1). B) Find the surface area under the restriction s + t