Sum of the edges

The sum of the lengths of all edges of the cube is 72 cm. How many cm² of colored paper are we going to use for sticking?

Correct result:

S =  216 cm²

Solution:

$$\begin{gathered} o=72\text{ cm } \\ o=12a \\ a=o\mathrm{/}12=72\mathrm{/}12=6\text{ cm } \\ S=6\cdot a^2=6\cdot 6^2=216{\text{cm}}^2 \end{gathered}$$

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