228 in²
Explanation:
Surface area of a cuboid is;
SA = 2lw + 2lh + 2hw
We are given;
Length; l = 6 inches
Width; w = 10 inches
Height; h = 4 inches
SA = 2(6 * 10) + 2(6 * 4) + 2(4 * 10)
SA = 120 + 48 + 80
SA = 228 in²
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