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

To find the diagonal of the square,we would first need to find it's length,which can be find by:
12÷4=3ft

To find diagonal,we can use the Pythagorean Theorem:

Which can also be written as ≈4.243

Thus,the answer could be: _/18 or 4.243

Hope it helps!