Answer:
33 960 cm²
Step-by-step explanation:
Note the door has 6 surfaces.
The front and back have the same dimensions, that is
2(200 × 80)
The top and bottom have the same dimensions, that is
2(80 × 3.5)
The sides have the same dimensions, that is
2(200 × 3.5)
Sum the area of the 6 faces for surface area of the door.
2(200 × 80) + 2(80 × 3.5) + 2(200 × 3.5)
= 32000 + 560 + 1400
= 33960 cm²
