The formula of an area of a square: [tex]A=a^2[/tex]
a - side
We have: [tex]A=324\ in^2[/tex]
substitute:
[tex]a^2=324\to a=\sqrt{324} \to a=18\ in[/tex]
The fromula of a perimeter of a square is: [tex]P=4a[/tex]
substitute:
[tex]P=4\cdot18=72\ in^2[/tex]
