Answer:
what do we have to solve? surface area? volume?
9 x 9 = 81
9 x 12.8 x 1/2 (basically just dividing by 2) = 57.6(area of 1 triangle), 57.6 x 4(there are 4 sides of triangles) = 230.4
Let's add all the given areas:
81 + 230.4 = 311.4 ft^2
