Question

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Answer 1

• See below

Explanation:

Total surface area includes the area of 4 walls, a floor area and a ceiling area

19.

Total surface area:

• S = x + 2y

20.

Area of 4 walls - area of the door:

• 160 - 20 = 140 m²

21.

One face of the cube is 20 m².

Total surface area comprises the area of 6 faces:

• S = 6*20 = 120 m²

22.

The perimeter of rectangle is the double of sum of two dimensions:

• P = 30*2 = 60 m