slant height(h) = 16.3ft
Base side = 20ft
[tex]\text{Area of pyramid=}\frac{1}{2\text{ }}\times perimeterofbase\text{ x slant height}[/tex]Perimeter of base = 4(base side) = 4(20) = 80ft
[tex]\begin{gathered} \text{Area of pyramid = }\frac{1}{2}\times80\times16.3 \\ \text{Area = }652ft^2 \end{gathered}[/tex]
