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.
the perimeter means the length around an object. so your perimeter around the object you have must be 8.
Perimeter = 4*13 = 52 units of measurment
in geometry, perimeter is the length around the outside of an object.
Perimeter = 6*13 = 78 units
The concept of a perimeter does not make sense for a solid object.
If it's a square, the perimeter is 24.
perimeter
Perimeter is the distance around an object and area is the amount of space/volume in an object (square,rectangle,triangle)
A square has equal length sides, so each side is 13 in. The perimeter is the distance of the 4 sides added together. The perimeter is: 13 + 13 + 13 + 13; which is 52 in.
Add up all the sides of the object you're trying to find the perimeter for.
You determine the perimeter of an object by adding up the lengths of all sides.