Body diagonal

Calculate the length of the body diagonal of the 6cm cube.

Correct answer:

u =  10.3923 cm

Step-by-step explanation:

$$\begin{gathered} a=6\text{ cm } \\ u=\sqrt{3}\cdot a=\sqrt{3}\cdot 6=6\sqrt{3}=10.3923\text{ cm} \end{gathered}$$

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