We can use the following general rule for the surface area of a square pyramid:
[tex]A=2bs+b^2[/tex]in this case, we have the following:
[tex]\begin{gathered} b=8 \\ s=10 \end{gathered}[/tex]then, using the formula, we get:
[tex]\begin{gathered} A=2(8)(10)+(8)^2=160+64=224 \\ \Rightarrow A=224\operatorname{cm}^2 \end{gathered}[/tex]therefore, the surface area is 224 cm^2
