6a. Find S. F. dr, where F(x, y) = < 4- 2y, 2x + y>, and C consists of the circle x' + y = 4 from (2,0) to (v2, v2 ) and the line segments from (v2, V2) to (0,0) and from (0, 0) to (2, 0). Sketch the path and evaluate. b. Convert (r, 0, z) = (5, -5) to (x, y, z) and (p, 0, 4). Angle in radian, up to two decimal places.