Answer:
=

Explanation:
(length of sqaure) x (width of square) =

since the length and width are the same for a square we can use the same letter for both length and width. If we chose 'a' to represent length and width then the formula can be rewritten:
(length of sqaure) x (width of square) =

l x w =

l = w = a
a x a =

=
