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Top = 5 x 3 = 15 sq ft

Bottom = 5 x 3 = 15 sq ft

2 sides = 5 x 7 = 35 sq ft each

other 2 sides = 3 x 7 = 21 sq ft each

Total cardboard = 142 square feet

Surface area = 142 sq ft inside, and 142 sq ft outside.

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13y ago
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Q: What is the surface area of a box 5 ft long 3 ft wide 7 ft high?
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