Final answer:
The area of the ceiling and the floor is 144 m² each, the gross wall area is 120 m², the net wall area after subtracting window space is 104 m², and the question does not provide enough information to calculate the area of the envelope represented by doors.
Step-by-step explanation:
The student's question involves calculating various areas of a structure and the envelope of a house, which includes the ceiling, the slab (or floor), the gross wall area, and the areas represented by windows and doors. Using the given dimensions, we can determine that the area of the ceiling and the slab is 144 m² each since the house footprint is 12 m by 12 m. The gross wall area can be calculated by multiplying the perimeter of the house (12 m x 4 sides = 48 m) by the wall height (2.5 m), yielding 120 m². However, we must subtract the area taken up by the windows (8 windows x 2 m² each = 16 m²) to find the net wall area, which is 104 m². The question does not provide specific measurements for the doors, so we cannot accurately calculate the square footage of the envelope represented by the doors without further information. To answer question C, details about the door area would be required, which are not provided.