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Sqaure root of 87.5ft :) this is closest to 9!
Answer:
The surface area of the cube is 
Step-by-step explanation:
we know that
The length of a diagonal of a cube is equal to

where
b is the length side of a cube
In this problem we have

so

solve for b

Simplify

<em>Find the surface area of the cube</em>
The surface area of the cube is equal to

substitute the value of b
