To find the surface area of the textbook, we need to calculate the surface area of each side and then add them together.
The textbook has 6 sides:
1. Front: 2 in. × 14 in. = 28 in^2
2. Back: 2 in. × 14 in. = 28 in^2
3. Top: 2 in. × 9 in. = 18 in^2
4. Bottom: 2 in. × 9 in. = 18 in^2
5. Left side: 14 in. × 9 in. = 126 in^2
6. Right side: 14 in. × 9 in. = 126 in^2
Now, add all the sides together:
28 + 28 + 18 + 18 + 126 + 126 = 344 in^2
Therefore, the surface area of the textbook is 344 in^2. So, the correct answer is d. 344 in^2.
Find the surface area of a textbook that is 2 in. × 14 in. × 9 in.
a. 252 in.^2
b. 50 in.^2
c. 172 in.^2
d. 344 in.^2
1 answer
1 answer