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Question

find the surface area of a textbook that is 2 in. x 14 in. x 9 in.
Answers:
172 in ^2
50 in^2
344 in^2
252 in^2

Answer 1

To find the surface area of the textbook, we need to add up the areas of all its sides.

The textbook has 6 sides:
1. Top and bottom: 2 in. x 14 in. = 28 in^2 each
2. Sides: 2 in. x 9 in. = 18 in^2 each
3. Front and back: 14 in. x 9 in. = 126 in^2 each

Adding up these areas:
Surface area = (28 in^2 + 28 in^2) + (18 in^2 + 18 in^2) + (126 in^2 + 126 in^2)
Surface area = 56 in^2 + 36 in^2 + 252 in^2
Surface area = 344 in^2

Therefore, the surface area of the given textbook is 344 in^2.