To find the surface area of the textbook, we need to find the area of each face and then add them together.
The textbook has 6 faces:
- The top and bottom faces are both 2 in. × 9 in. = 18 square inches each.
- The front and back faces are both 2 in. × 14 in. = 28 square inches each.
- The left and right faces are both 14 in. × 9 in. = 126 square inches each.
Adding up all the face areas, we have:
18 + 18 + 28 + 28 + 126 + 126 = 344 square inches.
Therefore, the surface area of the textbook is 344 square inches.
Find the surface area of a textbook that is 2 in. × 14 in. × 9 in. (1 point)
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