Remember that a square has four equal sides, and that if each side of the square is [tex] x[/tex], then the area is [tex]x^2[/tex]. So [tex] x^2=200\implies x=\sqrt{200}=\sqrt{100}\cdot\sqrt{2}=10\sqrt{2}\approx 10\cdot 1.414\approx 14.14\approx 14[/tex]
