Formulas for square pyramid:
[tex]SA=a^2+2a \sqrt{ \frac{a^2}{4}+h^2 } \\ V=a^2* \frac{h}{3} [/tex]
a means the base edge and h means height or altitude.
[tex]SA=10^2+20 \sqrt{ \frac{10^2}{4} +9^2} \\ =100+20 \sqrt{25+81} \\ =100+20 \sqrt{106}cm^2 [/tex]
[tex]V=a^2* \frac{h}{3}=10^2* \frac{9}{3} =100*3=300cm^3[/tex]
