An aicraft is flying in level flight at a speed of 200 km/hr through air (density, r = 1.2 kg/m², and viscosity m = 1.6 × 10^–5 N-s/m²). The lift co-efficient at this speed is 0.4 and the drag co-efficient is 0.0065. The mass of the aircraft is 800 kg. The effective lift area of the aircraft is