Salutations!
We know tat square has equal sides, so we will just multiply 20 twice as in [tex]S*S[/tex] or [tex]S^2[/tex]. Both of them are equal.
Area of the front cover of the notebook = [tex]s^2[/tex]
= [tex]20*20[/tex]
= [tex]400cm^2[/tex]
Hope I helped (:
have a great day!
