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It could be the length.
Surface area of any pyramid is 1/2Pl + B; where P=perimeter of the base, l=slant height and B= Area of the base.
a rectangular pyramid has a rectangular base and two pairs of congruent triangle sides. Given the height of the pyramid as well as its length and width, the area equals (l * w) + (l * (sq. rt ((w/2)^2 + h^2)) + (w * (sq. rt ((l/2)^2 + h^2)).
P*H+2*(L*B) Perimeter*Height+2*(lenght*Breadth)
To determine the surface area of a period (right rectangular), there is a unique formula. It is lw+l to the square root of w/2 squared + h squared + w square root of (l/2) squared + h squared. L=Length, W=Width, H=Height.