Question 1175762
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Strongly speaking,  there is no such term and such a notion/(conception) in  Geometry as  "perimeter of a cube".



There is the term,  the notion and the conception of the perimeter of a polygon  (triangle,  square,  parallelogram,

trapezoid,  pentagon,  hexagon,  octagon,  decagon and so on . . . )



But not for a cube.



I think that it is more important for you to know the  TRUE,  rather than to solve incorrectly formulated problems


invented/composed/created by mathematically illiterate people.



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To read and to learn about the conception of  PERIMETER,  look into this authoritative source  (Wikipedia article)


https://en.wikipedia.org/wiki/Perimeter



You will not find there any mentions about the  "perimeter of a cube".