Answer:-
Base of the pyramid is a square
☆Area=(side)^2
[tex]\\ \sf\longmapsto Area=(3)^2[/tex]
[tex]\\ \sf\longmapsto Area=9m^2[/tex]
[tex]\boxed{\ast\sf Volume=Area\;of\:base\times Height}[/tex]
[tex]\\ \sf\longmapsto Volume=9\times 2[/tex]
[tex]\\ \sf\longmapsto Volume=18m^3[/tex]
[tex]\\ \sf\longmapsto Volume=180000cm^3[/tex]
We know
[tex]\boxed{\maltese\sf 1cm^3=1m\ell}[/tex]
[tex]\\ \sf\longmapsto 180000cm^3=180000m\ell[/tex]
[tex]\\ \sf\longmapsto 180\ell[/tex]
Box will contain 180litres air
