The area of a 2D form is the amount of space within its perimeter. The cost to build the storage building walls is $2,970. The correct option is D.
What is an area?
The area of a 2D form is the amount of space within its perimeter. It is measured in square units such as cm², m², and so on. To find the area of a square formula or another quadrilateral, multiply its length by its width.
Given that the building is 12 feet by 15 feet and 10 feet tall. Therefore, there will be 2 walls of 12 feet long and 2 walls of 15 feet in length. Also, the height of all the walls will be 10 feet. Thus, the total area of the wall can be written as,
The total area of the wall = 2(15ft× 10ft) + 2(12ft× 10ft)
= 2(150 ft²) + 2(120ft²)
= 300 ft² + 240 ft²
= 540 ft²
Further, the stonework costs $5.50 per square foot. Therefore, the cost of stonework on the wall will be,
Cost of stonework = $5.50 per square foot × 540 ft²
= $2,970
Hence, the cost to build the storage building walls is $2,970.
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