Square and circle

Into square is an inscribed circle with diameter 10 cm. What is the difference between circumference square and circle?

Correct answer:

x =  8.5841 cm

Step-by-step explanation:

$$\begin{gathered} D=10\text{ cm } \\ {o}_1=4\cdot D=4\cdot 10=40\text{ cm } \\ {o}_2=\pi \cdot D=3.1416\cdot 10\doteq 31.4159\text{ cm } \\ x=o_1-o_2=40-31.4159=8.5841\text{ cm} \end{gathered}$$

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