Answer:
13.7 inches
Step-by-step explanation
<em>Area = base*height</em>
(since it's a square, the lengths of all four sides of the board are equal. therefore, we can write the equation above like the following)
<em>Area of square = side length^2</em>
(square root both sides of the equation, and you get the following)
<em />
<em> </em><em>= side length</em>
(now, substitute the info)
<em />
<em> = x</em>
(solve)
<em>x = 13.7 inches</em>
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