Area of a cube

Calculate the surface area of a cube if its volume is equal to 729 cubic meters.

Correct answer:

S =  486 m²

Step-by-step explanation:

$$\begin{gathered} V=729{\text{m}}^3 \\ V=a^3 \\ a=\sqrt[3]{V}=\sqrt[3]{729}=9\text{ m } \\ {S}_1=a^2=9^2=81{\text{m}}^2 \\ S=6\cdot S_1=6\cdot 81=486{\text{m}}^2 \end{gathered}$$

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