it is l+w= that's the fomuler
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the perimeter means the length around an object. so your perimeter around the object you have must be 8.
in geometry, perimeter is the length around the outside of an object.
The perimeter is a characteristic of a 2-dimensional object. A 12 by 13 by 5 sounds like a 3-dimensional object which would not have a perimeter.
If it's a square, the perimeter is 24.
The concept of a perimeter does not make sense for a solid object.