What is the approximate length of the diagonal of a square if the perimeter of the square is 12 feet?

The perimeter = 12 feetthen the square diagonal = 12/4 = 3 feet

The diagonal2 = 3x3 + 3x3= 18 feet

The diagonal = square root of 18 = 3x 21/2 feet = 3 x 1.4142 = 4.2426 feet