Yes, you can use it.
example you are only given the area of a bulletin board. And you are asked to find the length and the width of the bulletin board. Knowing that a bulletin board can be square or rectangle. You can you the formula:

Area of a rectangle:

Area=Length  x  Width


let x = length
let y = width

A = (x)(y)

if x = y

A= x^{2}

then it is a square.

hit thank you if this helps you!
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