A rectangular prism is a cuboid.
Given data
Length L = 12 in
Width W = 6 in
Height H = 6 in
Next, apply the surface area of a cuboid.
Surface area of a cubiod = 2LH + 2LW + 2WH
= 2 x 12 x 6 + 2 x 12 x 6 + 2 x 6 x 6
= 144 + 144 + 72
= 360 square in
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