Answer:
90 square feet
Explanation:
area of rectangle = 12 X 30 = 360 square feet
look at the green triangle in top left. it has area 0.5 X (12 - 3) X (30)
= 0.5 X 9 X 30 = 135
area of other green triangle is equal (they are congruent)
so, the area of the path is 360 - 2 (135) = 360 - 270 = 90 square feet