Perimeter from area

What is the perimeter of the square if its content is 64 cm²?

Correct result:

x =  32 cm

Solution:

$$\begin{gathered} S=64 \\ a=\sqrt{S}=\sqrt{64}=8 \\ x=4\cdot a=4\cdot 8=32\text{ cm} \end{gathered}$$

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