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Well it depends what your asking, if your just looking for the perimiter it would be length times 2 plus height times 2. Now if your looking for lateral surface area the formula would be length times height times 2 plus length times height times 2,
heres a better look at the formula.
perimiter (P) = L+L+W+W
lateral surface area (LSA) = 2xLxH +2xWxH
Now if your looking for total surface area (The total surface area of a rectangular solid includes the lateral suface area plus the area of the top and bottom) The formula would be.
Total surface area (TSA)= 2xLxH + 2xWxH + 2xLxW
W = Width
L = Length
h = Height
Well I hope that helps
Karp
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