Answer:
9 feet on each edge
Step-by-step explanation:
Since the Total surface of a cube is calculated by a formula S=6a² (a cube is made up by six squares, and its turn a square has 4 sides the same size.
We have S=6a²
Then:
[tex]486=6a^{2} \\ \frac{486}{6}=\frac{6a^{2} }{6} \\81=a^{3} \\ \sqrt{81}=\sqrt{a^{2}} \\a=9[/tex]
So a cube has 12 edges each one sizes 9 feet
