Ashed has walls that are 12ft in length, 8 ft in width, and 3 m in height. the roof is in the shape of a rectangular-based pyramid whose height reaches 1 m above the walls at its highest point. the doorway measures 1.5 m by 2.5 m. the two congruent windows each have an area of 1.4 m2. imagine that is the house. the entire shed, excluding the windows and doorway, needs to be covered in plastic sheeting to make it waterproof. determine the surface area that needs to be covered.