How to find out which of these shapes is a cube>

A cube is a solid (not flat) shape, all the faces of which are squares.
 

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A cube is a solid shape, in which all sides (length, width, and height) are equal. The faces of the cube are called lateral sides. All the lateral sides of the cube are squares. Generally, the cube has six lateral sides: four side parts, one upper, and one lower. We can say that the cube consists of six squares. The side of the cube where two squares intersect is called the edge of the cube. In total, the cube has twelve edges, and they are all equal to each other.

The point at which the sides of the cube intersect is called the vertex of the cube. The cube has eight vertices.

Find a cube among these figures.
 

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