A sphere of radius r lies inside a cube and touches each of the six sides of the cube. Calculate the volume of the cube

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Q 3082312237.     A sphere of radius r lies inside a cube and touches each of the six sides of the cube. Calculate the volume of the cube in terms of r.
A

 r ^{ 3 }

B

2r ^{ 3 }

C

4 r ^{ 3 }

D

\frac { 4 }{ 3 } \pi r ^{ 3 }

E

8 r ^{ 3 }

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