Answer:
[tex]486\ in^2[/tex]
Step-by-step explanation:
we know that
The surface area of the cube is equal to the area of its six square faces
so
[tex]SA=6b^2[/tex]
where
b is the length side of the cube
we have
[tex]b=9\ in[/tex]
substitute
[tex]SA=6(9)^2=486\ in^2[/tex]
