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To find the square's side length given the area, we need to look at the equation for a square's area.
$A=s_{2} $
In the case of our exercise, the area, $A,$ is $169m_{2}$. We can set up our quadratic and solve for the length of the side, $s,$ by substituting our value for $A.$
Since in this case we are dealing with length, we can disregard the negative root and say that the length of the side of this square is $13m.$