Apologies for the confusion caused by my previous response. I made an error in my calculations.
Let's re-evaluate the problem correctly.
We have a square with one side measuring 16 units and another side measuring 9 units.
To find the length of the remaining side (denoted as "s"), we can use the Pythagorean Theorem.
According to the theorem, in a right triangle, the square of the length of the hypotenuse (the longest side, denoted as "c") is equal to the sum of the squares of the other two sides (legs, denoted as "a" and "b").
In this case, we can consider the two given sides (16 and 9) as the legs of a right triangle.
Using the Pythagorean Theorem, we have:
c^2 = a^2 + b^2
Substituting the given values into the equation:
c^2 = 16^2 + 9^2
c^2 = 256 + 81
c^2 = 337
To find the value of c (the length of the remaining side), we take the square root of both sides:
c = √337
Using a calculator, the square root of 337 is approximately 18.36.
Therefore, the length of the remaining side (the last side of the square) would be approximately 18.36 units.