Answer:
shaded region : 591 square kilometres
Explanation:
Area of the whole rectangle = L * W = 32 * 20 = 640 square kilometres
Area of unshaded region = ( 5 * 9 ) + ( 4 * 1 ) = 49 square kilometres
the shaded region = Area of the whole rectangle - Area of unshaded region
= 640 - 49
= 591 square kilometres