Answer
$13$ inches
Work Step by Step
A square with area $160$ square inches will have side lengths that are the square root of the area.
This is because, for a square, Area = $s^2$, so $s=\sqrt A$
With an area of $160$ inches squared, $s=\sqrt {160}$
We will use method 2 in the book to estimate the square root.
According to a calculator's square root function, $\sqrt {160}\approx12.65$ inches
Since $12.65$ is closer to $13$ than to $12$, we round to the nearest integer which is $13$ inches.
