Calculate

Calculate the length of the wall diagonal of the cube with an edge 5 cm long.

Correct answer:

u =  7.0711 cm

Step-by-step explanation:

$$\begin{gathered} a=5\text{ cm } \\ {u}^2=a^2+a^2 \\ {u}^2=2a^2 \\ u=\sqrt{2}\cdot a=\sqrt{2}\cdot 5=5\sqrt{2}=7.0711\text{ cm} \end{gathered}$$

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