The figure below shows a shed in the shape of a rectangular prism. Note that the shed has a floor.

Step-by-step explanation:

a). Volume of a rectangular prism = Length × width × height

                                                        = 13 × 8 × 12

                                                        = 1248 cubic ft

     Surface area of a rectangular prism = (lb + bh + hl)

     Here, l = length, b = width and h = height of the rectangular prism

     Surface area of the given prism = (13×8 + 8×12 + 12×13)

                                                           = 356 square ft

b). If the shed is made of metal,

    Metal needed to make the shed = Volume

c). The shed is used for the storage.

    Measure would be used → Surface area