A cube is sliced into halves in such a way that the cut is a _ _ .
The statement above is true. Which of the following can not be written to the line?
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I didn't make an example for a not regular hexagon, but it easy find one from the regular hexagon.
If the cut is a pentagon, then the pentagon touches exactly five faces, so it touches to parallel faces (for sure). So the pentagon will have two parallel sides, therefore it can't be regular.