Surface area = 2LW + 2(L+W)H
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2(l*w)+2(w*h)+2(l*h)=surface area
Squared. When you find surface area, you are only finding the area of the shapes that make up the three-denominational shape.
lw + lh + wh x2
There is no rectangular prism below 8 8 19.
To find the surface area of an equilateral triangular prism you take the area of the rectangular sides and the triangular bases and add them up and your done.