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The object shown in the figure below is a cube (all edges are equal in length).
If the length of each edge of the cube shown in the figure below is unknown, we can represent it with the variable x. Then we can write formulas for the lengths \text  of any of the diagonals. Finish each of the following statements. 
 
(a) If the length of each edge of a cube is x, then the length of the diagonal of any face of the cube will be _____________
 
(b) If the length of each edge of a cube is x, then the length of any diagonal that passes through the center of the cube will be _____________

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