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It is: 8*5 = 40 square inches
8 square feet is the area.
40 square units
40 square feet. Multiply length by width - the result is the area in square feet.
Surface area = 2*(8*5 + 5*2.5 + 2.5*8) = 2*(40 + 12.5 + 20) = 2*72.5 = 145 square units.