Ideal gas helium flows through a well-insulated nozzle at steady state. The temperature and velocity at the inlet are 90 °C and 30 m/s, respectively. At the exit, the temperature is -18 °C and the pressure is 3.1 bar. The mass flow rate is 1.25 kg/s. Using the ideal gas model, and neglecting potential energy effects, determine the exit area. Take cp,He to be 5.193 kJ/kg·K. Answer in m².