Body diagonal

Calculate the length of the body diagonal of a block with dimensions:
a = 20 cm, b = 30 cm, c = 15 cm.

Correct answer:

d =  39.0512 cm

Step-by-step explanation:

$$\begin{gathered} a=20\text{ cm } \\ b=30\text{ cm } \\ c=15\text{ cm } \\ d=\sqrt{a^2+b^2+c^2}=\sqrt{20^2+30^2+15^2}=5\sqrt{61}=39.0512\text{ cm} \end{gathered}$$

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