The downstairs garage is a rectangular prism of these dimensions:
- length = L = 13 yards = 13*3 = 39 feet
- width = W = 28 feet
- height = H = 12 feet
The volume of the rectangular prism is the result of multiplying those values.
volume = length*width*height
V = L*W*H
V = (39 ft)*(28 ft)*(12 ft)
V = (39*28*12)*( ft*ft*ft)
V = 13104 ft^3
The volume of the garage is exactly 13104 cubic feet
Unfortunately there isn't enough information to determine the volume of the upstairs office. The height of the office isn't shown.