(1) Let 11 = {1,2,3) and V = (5,2, l). (a) Find a unit vector orthogonal to both 11 and v. (13) Find the area of the parallelogram determined by u and v. (2) Find the area of the triangle with vertieee A(1, 1), 3(2, 3) and C(1, 1). (3) Show that (u V) x (u |V) 2 2(11 K 1:). (1) Show that \"u x V\"? + (11 NV)? 2 ||u||2||v||2