To find the surface area of a rectangular prism, you need to find the area of each of the six faces and then add them together.
The dimensions of the textbook are 2 in., 14 in., and 9 in.
The area of the first face (2 in. x 14 in.) is 28 in².
The area of the second face (2 in. x 9 in.) is 18 in².
The area of the third face (14 in. x 9 in.) is 126 in².
Since each face has an identical face on the opposite side, you need to double the sum of these areas.
2(28 in² + 18 in² + 126 in²) = 392 in².
Thus, the correct answer is c) 344 in.
find the surface area of a textbook that is 2 in. x 14 in. x 9 in.
a 252 in.
b 50 in.
c 344 in.
d 172 in.
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