What is the area of the walls of a house if it is 40' long, 20' wide, and 10' tall?

What is the area of the walls of a house if it is 40' long, 20' wide, and 10' tall?

• A. 800 ft2
• B. 600 ft2
• C. 700 ft2
• D. 500 ft2

Answer: (A)

To determine the area of the walls of the house, we need to calculate the total surface area of the four walls. There are two pairs of opposing walls: the longer walls and the shorter walls. The longer walls are each 40 feet long and 10 feet tall. Therefore, the area of one longer wall is calculated as follows: Area of one longer wall = length × height = 40 ft × 10 ft = 400 ft². Since there are two longer walls, the total area for these walls is: Total area of longer walls = 2 × 400 ft² = 800 ft². The shorter walls are each 20 feet long and also 10 feet tall. The area of one shorter wall is: Area of one shorter wall = width × height = 20 ft × 10 ft = 200 ft². Again, since there are two shorter walls, the total area for these walls is: Total area of shorter walls = 2 × 200 ft² = 400 ft². Adding the area of both pairs of walls together gives: Total wall area = Total area of longer walls + Total area of shorter walls Total wall area = 800 ft² + 400 ft² =

To determine the area of the walls of the house, we need to calculate the total surface area of the four walls. There are two pairs of opposing walls: the longer walls and the shorter walls.

The longer walls are each 40 feet long and 10 feet tall. Therefore, the area of one longer wall is calculated as follows:

Area of one longer wall = length × height = 40 ft × 10 ft = 400 ft².

Since there are two longer walls, the total area for these walls is:

Total area of longer walls = 2 × 400 ft² = 800 ft².

The shorter walls are each 20 feet long and also 10 feet tall. The area of one shorter wall is:

Area of one shorter wall = width × height = 20 ft × 10 ft = 200 ft².

Again, since there are two shorter walls, the total area for these walls is:

Total area of shorter walls = 2 × 200 ft² = 400 ft².

Adding the area of both pairs of walls together gives:

Total wall area = Total area of longer walls + Total area of shorter walls

Total wall area = 800 ft² + 400 ft² =