Answer:
Step-by-step explanation:
Total surface area includes the area of 4 walls, a floor area and a ceiling area
19.
Total surface area:
20.
Area of 4 walls - area of the door:
21.
One face of the cube is 20 m².
Total surface area comprises the area of 6 faces:
22.
The perimeter of rectangle is the double of sum of two dimensions:
