Calculate

Calculate the square area if its perimeter is 14dm.

Correct answer:

S =  12.25 dm²

Step-by-step explanation:

$$\begin{gathered} o=14\text{ dm } \\ o=4a \\ a=o\mathrm{/}4=14\mathrm{/}4={\displaystyle \frac{7}{2}}=3.5\text{ dm } \\ S=a^2=a\cdot a \\ S=a\cdot a=3.5\cdot 3.5={\displaystyle \frac{49}{4}}={\displaystyle \frac{49}{4}}{\text{dm}}^2=12.25{\text{dm}}^2 \end{gathered}$$

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