The chainages (m) and corresponding perpendicular offsets(m) taken from a chain line to an irregular boundary were (0, 0), (30, 2.65), (60, 3.80), (90, 3.75), (120, 4.65), (150, 3.60), (180, 5.00) and (210, 5.80). The area (m²) between the chain line and the irregular boundary by Simpson's rule is