Body diagonal

Find the length of the body diagonal of a cuboid with lengths of 16 cm, 7 cm, and 4 cm.

Correct result:

s =  17.9165 cm

Solution:

$$\begin{gathered} a=16\text{ cm } \\ b=7\text{ cm } \\ c=4\text{ cm } \\ s=\sqrt{a^2+b^2+c^2}=\sqrt{16^2+7^2+4^2}=\sqrt{321}=17.9165\text{ cm} \end{gathered}$$

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