The length of the diagonal is 17 in
Step-by-step explanation:
The area of the square =

The formula for area of the square is given by



The sides of the square are 12 inches.
The length of the diagonal of a square can be determined using the Pythagorean theorem.
Let d be the diagonal of the square.
Thus, we have,




Rounding off to the nearest inch, we get,

Thus, the length of the diagonal is 17 in