The base of a rectangular prism is just an old familiar 2D rectangle.
All the old familiar 2D formulas for rectangles still apply to it.
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The base of a prism is always rectangular, so the area, A, =lw. l is length, w is width, of the base.
Squared. When you find surface area, you are only finding the area of the shapes that make up the three-denominational shape.
Surface area = 2LW + 2(L+W)H
area of base x height area of base x height
2(l*w)+2(w*h)+2(l*h)=surface area