The surface area of rectangular prism is 396 [tex]inch^{2}[/tex]
What is rectangular prism?
In geometry, a rectangular prism can be defined as a 3-dimensional solid shape which has six faces that are rectangles. A rectangular prism is also a cuboid.
According to the  question,
Length of rectangular prism(l) = 7 inch
Height of rectangular prism(h) = 12 inch
Width of rectangular prism(w) = 6 inch
Given  formula of Surface area = 2lw + 2lh + 2wh
                                                     = 2×7×6 + 2×7×12 + 2×6×12
                                                     = 84 + 168 + 144
                                                     =  396 [tex]inch^{2}[/tex]
Hence, the surface area of prism = 396 [tex]inch^{2}[/tex]
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