Answer:
The length of the diagonal is 22.6 ft.
Explanation:
To find the length of the diagonal of a square, multiply the length of one side by the square root of 2:
If the length of one side is x,
as you can see in the image attached.
This fact is a consequence of applying the Pythagoras' Theorem to find the length of the diagonal if we know the side length of the square.

We know that the length of one side is 16 ft so
and round to the nearest tenth is 22.6 ft