Answer:
9 x 12 x 1/2 x 2 = (two area's of triangles on the sides) = 108
12 x 9 x 1/2 = (base triangle's area) 54
12 x 9 x 1/2 = (area of triangle behind) 54
Add given areas:
54 + 54 + 108 = 216 ft^2 I THINK.
Im really unsure about this.. please wait for more responses I REALLY am not sure about this answer.
