The total surface area of the building is the  sum of the total faces an object contains. The walkway should be about 2.57feet
The total surface area of the building is the  sum of the total faces an object contains. The formula is expressed as:
TSA = 2(lw + wh + lh)
where
Given the following parameters
TSA = 168 square feet
length = 8feet
Height = 6 feet
Required
Width of the walkway
Substitute
168 = 2(lw + wh + lh)
84 = (8(6) + 6w + 8w)
84 = 48 + 14w
14w = 84 - 48
14w = 36
w = 2.57feet
Hence the walkway should be about 2.57feet
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