Find the surface area of a textbook that is 2 in. × 14 in. × 9 in. (1 point)
Responses
252 in.2
252 in. squared
344 in.2
344 in. squared
50 in.2
50 in. squared
172 in.2
The surface area of a rectangular prism is calculated by adding the areas of all six faces.
In this case, the textbook has dimensions of 2 in. × 14 in. × 9 in.
The surface area of the first face is 2 in. × 14 in. = 28 in.2
The surface area of the second face is 2 in. × 14 in. = 28 in.2
The surface area of the third face is 2 in. × 9 in. = 18 in.2
The surface area of the fourth face is 2 in. × 9 in. = 18 in.2
The surface area of the fifth face is 14 in. × 9 in. = 126 in.2
The surface area of the sixth face is 14 in. × 9 in. = 126 in.2
Adding up all the surface areas:
28 in.2 + 28 in.2 + 18 in.2 + 18 in.2 + 126 in.2 + 126 in.2 = 344 in.2
So, the correct answer is 344 in.2