The perimeter of the square below can be described by the expression 64 + 12y. A square. Which of the expressions describes the length of one side of the square? A square has 4 equal sides. StartFraction 64 over 4 End Fraction = 16; StartFraction 12 y over 4 End Fraction = 3 y 16 + 12y 4 + 12y 4 + 3y 16 + 3y