Find the volume of the swimming pool

Question

an above-ground swimming pool is shaped as shown in this figure; i.e., its length = 80 ft (same at the top and bottom), its width f1 = 40 ft at the bottom and increases to f2 = 52 ft at the top, and its depth d = 8 ft throughout. Note that the front and back surfaces are vertical while the side surfaces are inclined.

The answer is 29440 ft^3 but I keep getting answers like 33,000

Answer 1

See comment above

Answer 2

trapezoidal prism

bottom base=52

top base = 40

height = 8

area of the trapezoid =

1/2 * height * (top+bottom) =

1/2 * 8 * (40+52) =

4 * 92 = 368

the volume is then:

368 * 80 = 29440