Section: Mathematics Knowledge
16)
A box has dimensions of 3 inches, 5 inches and 7 inches. What is the surface area?
Explanation
The surface area of a rectangle is:
2 x (l x w) + 2 x (h x w) + 2 x (l x h) where l = length, w = width and h = height
2 x (3 x 5) + 2 x (7 x 5) + 2 x (3 x 7) = 2 x 15 + 2 x 35 + 2 x 21 = 142 inches
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