The formula of a volume of pyramid:
[tex]V=\dfrac{1}{3}Bh[/tex]
[tex]B=13\cdot13=169\ cm^2[/tex]
[tex]h=9\ cm[/tex]
substitute
[tex]V=\dfrac{1}{3}\cdot169\cdot9=169\cdot3=507\ cm^3[/tex]
