Assuming a rectangular prism, each of the sides are represented twice. Calculate the area of each of the sides.
2 X 4 = 8
2 X 6 = 12
4 X 6 = 24
8 + 12 + 24 = 44
44 X 2 = 88
The surface area of a 6 X 4 X 2 prism is 88.
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Surface area = 2*(4*4 + 4*6 + 6*4) = 2*64 = 128 sq inches.
Surface area = 2*(2*6 + 6*2 + 2*2) = 2*(12 + 12 + 4) = 2*28 = 56 square mm.
Surface area of a rectangular prism = 2 x (length x width + width x height + height x length → surface area = 2 x (24 in x 4 in + 4 in x 5 in + 5 in x 24 in) = 472 sq in.
With a rectangular prism with these dimensions, you'd have 2 sides with an area of 15*5, two sides with an area of 5*4 and two sides with an area of 4*15. The surface area is 15*5+15*5+5*4+5*4+4*15+4*15 = 310.
2*(4*4)+2*(4*8)+2*(8*4) = 32 + 64 + 64 = 160 sq units