A cube could be described as a box, or as a three dimensional square.
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hexahedron
A cube
false
Individual points on one side of the cube are coplanar. Points on one side might not nessasarily be coplanar with points on another side. The corners of a cube are exactly coplanar to three planes, but not all planes of the cube. In fact, no point on the cube is coplanar to all other points on the cube.
The principal diagonal.