(4) Let F = = (x², xy, (x + y)z). Find the circulation, to the nearest hundredth, of F on the oriented simple closed curve consisting of a line segment from (0, 0, 0) to (2,0,0), followed by a line segment from (2, 0, 0) to (2, 1, 1), followed by a line segment from (2, 1, 1) to (0, 1, 1), and then returning to (0, 0, 0).