The same way you find the perimeter of a rectangle, add the side lengths
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1/2 AP where A=apothem and P= perimeter
2*area of a base + length*perimeter of base.
Surface Area = 2 × Base Area + Base Perimeter × Length
Add up all of the lengths of the edges adjacent to one of the bases.
TSA=total surface area=2Xarea of base + perimeter of baseXheight