You add up the lengths of every side.
For example, if you have a pentagon (five sided figure) and every side is 4 inches long, you add 4+4+4+4+4=20inches.
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no If the shape of the object is not fixed, it would be possible to alter the shape of the perimeter, but not the length, i.e., the distance around the object being enclosed.
The perimeter is the border or outer boundary around a two dimensional figure and is the length of such a boundary - a field for example, a perimeter fence
Unless the object is symmetrical, you may not be able to. If you don't have a square or equilateral triangle type object, you can't.
If the figure is 2-dimensional, it is called the perimeter.
the perimeter means the length around an object. so your perimeter around the object you have must be 8.