How to solve
A box has three pairs of matching faces: SA = 2(lw + lh + wh).
Steps
- Compute the three face areas lw, lh, wh.
- Add them.
- Double the sum.
Example
A box is 4 by 3 by 2.
- lw + lh + wh = 12 + 8 + 6 = 26.
- SA = 2 × 26 = 52.
Answer: 52
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