Perimeter of square

The square has a circumference 17cm. What is its area?

Correct result:

S =  18.0625 cm²

Solution:

$$\begin{gathered} o=17\text{ cm } \\ a=o\mathrm{/}4=17\mathrm{/}4={\displaystyle \frac{17}{4}}=4{\displaystyle \frac{1}{4}}=4.25\text{ cm } \\ S=a^2=4.25^2={\displaystyle \frac{289}{16}}=18{\displaystyle \frac{1}{16}}={\displaystyle \frac{289}{16}}{\text{cm}}^2=18.0625{\text{cm}}^2 \end{gathered}$$

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