A glass window pane is exactly 20 cm by 36 cm at 10oC. By how much has its area increased when it temperature is 33oC, assuming that it can expand

A glass window pane is exactly 20 cm by 36 cm at 10oC. By how much has its area increased when it temperature is 33oC, assuming that it can expand freely? Take the coefficient of thermal expansion for the glass to be exactly 9 x 10-6/Co.