Chapter 1 - Foundations for Algebra - 1-3 Real Numbers and the Number Line - Practice and Problem-Solving Exercises - Page 20: 25

13 inches

The area of a square is the length of a side squared. Thus, this problem requires the exact same process as 19 through 23 where we approximate the square root of the area, so we consider the closest square root that gives us an integer answer. We know that the square root of 169 is 13. The square root of 169 is fairly close to the square root of 160, so 13 inches is a good approximation for the length of a side of the game board from the problem.